


Arabic Ibn Sīnā in full Abū hamzahAlī al-Hsubdotusayn ibn aynAbd Allāh ibn Sīnā

(born 980, Bukhara, Iran—died 1037, Hamadan) Islamic philosopher and scientist. He became physician to several sultans and also twice served as vizier. His Canon of Medicine was long a standard work in the field. He is known for his great encyclopaedia of philosophy, The Book of Healing. His other writings include The Book of Salvation and The Book of Directives and Remarks. His interpretations of Aristotle influenced European Scholasticism. His system rests on a conception of God as the necessary existent: only in God do essence (what God is) and existence (that God is) coincide.

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(Persian/ابو علی الحسین ابن عبدالله ابن سینا); (born c. 980 near Bukhara, Khorasan, died 1037 in Hamedan), also known as Ibn Seena and commonly known in English by his Latinized name Avicenna (Greek Aβιτζιανός), was a Persian polymath and the foremost physician and philosopher of his time. He was also an astronomer, chemist, geologist, logician, paleontologist, mathematician, physicist, poet, psychologist, scientist, soldier, statesman, and teacher.

Ibn Sīnā wrote almost 450 treatises on a wide range of subjects, of which around 240 have survived. In particular, 150 of his surviving treatises concentrate on philosophy and 40 of them concentrate on medicine. His most famous works are The Book of Healing, a vast philosophical and scientific encyclopaedia, and The Canon of Medicine, which is a standard medical text at many Islamic and European universities. The Canon of Medicine was used as a text-book in the universities of Montpellier and Louvain as late as 1650. Ibn Sīnā developed a medical system that combined his own personal experience with that of Islamic medicine, the medical system of the Greek physician Galen, Aristotelian metaphysics (Avicenna was one of the main interpreters of Aristotle), and ancient Persian, Mesopotamian and Indian medicine. He was also the founder of Avicennian logic and the philosophical school of Avicennism, which were influential among both Muslim and Scholastic thinkers.

Ibn Sīnā is regarded as a father of early modern medicine, and clinical pharmacology particularly for his introduction of systematic experimentation and quantification into the study of physiology, his discovery of the contagious nature of infectious diseases, the introduction of quarantine to limit the spread of contagious diseases, the introduction of experimental medicine, evidence-based medicine, clinical trials, randomized controlled trials, efficacy tests, clinical pharmacology, neuropsychiatry, risk factor analysis, and the idea of a syndrome, and the importance of dietetics and the influence of climate and environment on health. He is also considered the father of the fundamental concept of momentum in physics, and regarded as a pioneer of aromatherapy for his invention of steam distillation and extraction of essential oils. He also developed the concept of uniformitarianism and law of superposition in geology.

George Sarton, an author of the history of science, wrote in the Introduction to the History of Science:


Avicenna created an extensive corpus of works during what is commonly known as Islam's Golden Age (ca 10-11 century CE), in which the translations of Graeco-Roman, Neo- and Mid-Platonic, and Aristotelian texts by the Kindi schools were commented, redacted and developed substantially by Islamic intellectuals, as well as building upon Persian and Indian mathematical systems, astronomy, algebra, trigonometry, and medicine. Samanid dynasty in Greater Khorasan and central Asia as well as Buwayhid on in western part of Persia and Iraq could provide a thriving atmosphere for scholarly and cultural development. Under the Samanids, Bukhara rivalled Baghdad as a cultural capital of Islam.

The study of Quran and Hadith throve in such a scholarly atmosphere. Philosophy Fiqh and theology kalam were further developed, most noticeably by Avicenna and his opponents. al-Razi and Al-Farabi had provided methodology and knowledge in medicine and philosophy. Avicenna could use the great libraries of Balkh, Khwarezm, Gorgan, Rey, Isfahan and Hamedan. As various texts, such as the 'Ahd with Bahmanyar show, he debated philosophical points with the greatest scholars of the time. As Aruzi Samarqandi describes in his four articles before Avicenna left Khwarezm he had met al-Biruni (a noted scientist and astronomer), Abu Nasr Iraqi (a renowned mathematician), Abu Sahl Masihi (a respected philosopher) and Abu al-Khayr Khammar (a great physician).


Early life

He was born in Persia around 980 in Afshana, in Bukhara province, his mother's home, a small city now part of Uzbekistan. His father, a respected Ismaili scholar of Balkh, an important town of the Persian state of Khorasan a part of Afghanistan, was at the time of his son's birth the governor in one of the Samanid Nuh ibn Mansur's estates. He had his son very carefully educated at Bukhara. Ibn Sina himself was a Twelver Shia. Ibn Sina's independent thought was served by an extraordinary intelligence and memory, which allowed him to overtake his teachers at the age of fourteen. As he said in his autobiography there wasn't anything which he hadn't learned when he reached eighteen.

Ibn Sīnā was put under the charge of a tutor, and his precocity soon made him the marvel of his neighbours; he displayed exceptional intellectual behaviour and was a child prodigy who had memorized the Qur'an by the age of 10 and a great deal of Persian poetry as well. He learned Indian arithmetic from an Indian greengrocer, and he began to learn more from a wandering scholar who gained a livelihood by curing the sick and teaching the young. He also studied Fiqh (Islamic jurisprudence) under the Hanafi scholar Ismail al-Zahid.

As a teenager, he was greatly troubled by the Metaphysics of Aristotle, which he could not understand until he read al-Farabi's commentary on the work. For the next year and a half, he studied philosophy, in which he encountered greater obstacles. In such moments of baffled inquiry, he would leave his books, perform the requisite ablutions (wudu), then go to the mosque, and continue in prayer (salah) till light broke on his difficulties. Deep into the night he would continue his studies, and even in his dreams problems would pursue him and work out their solution. Forty times, it is said, he read through the Metaphysics of Aristotle, till the words were imprinted on his memory; but their meaning was hopelessly obscure, until one day they found illumination, from the little commentary by Farabi, which he bought at a bookstall for the small sum of three dirhams. So great was his joy at the discovery, thus made by help of a work from which he had expected only mystery, that he hastened to return thanks to God, and bestowed alms upon the poor.

He turned to medicine at 16, and not only learned medical theory, but also by gratuitous attendance of the sick had, according to his own account, discovered new methods of treatment. The teenager achieved full status as a qualified physician at age 18, and found that "Medicine is no hard and thorny science, like mathematics and metaphysics, so I soon made great progress; I became an excellent doctor and began to treat patients, using approved remedies." The youthful physician's fame spread quickly, and he treated many patients without asking for payment.



When Ibn Sina was 22 years old, he lost his father. The Samanid dynasty came to its end in December 1004. Ibn Sina seems to have declined the offers of Mahmud of Ghazni, and proceeded westwards to Urgench in the modern Uzbekistan, where the vizier, regarded as a friend of scholars, gave him a small monthly stipend. The pay was small, however, so Ibn Sina wandered from place to place through the districts of Nishapur and Merv to the borders of Khorasan, seeking an opening for his talents. Shams al-Ma'äli Kavuus, the generous ruler of Dailam and central Persia, himself a poet and a scholar, with whom Ibn Sina had expected to find an asylum, was about that date (1052) starved to death by his troops who had revolted. Ibn Sina himself was at this season stricken down by a severe illness. Finally, at Gorgan, near the Caspian Sea, Ibn Sina met with a friend, who bought a dwelling near his own house in which Ibn Sina lectured on logic and astronomy. Several of Ibn Sina's treatises were written for this patron; and the commencement of his Canon of Medicine also dates from his stay in Hyrcania.

Ibn Sina subsequently settled at Rai, in the vicinity of modern Tehran, (present day capital of Iran), the home town of Rhazes; where Majd Addaula, a son of the last Buwayhid emir, was nominal ruler under the regency of his mother (Seyyedeh Khatun). About thirty of Ibn Sina's shorter works are said to have been composed in Rai. Constant feuds which raged between the regent and her second son, Shams al-Daula, however, compelled the scholar to quit the place. After a brief sojourn at Qazvin he passed southwards to Hamadãn where Shams al-Daula, another Buwayhid emir, had established himself. At first, Ibn Sina entered into the service of a high-born lady; but the emir, hearing of his arrival, called him in as medical attendant, and sent him back with presents to his dwelling. Ibn Sina was even raised to the office of vizier. The emir consented that he should be banished from the country. Ibn Sina, however, remained hidden for forty days in a sheikh Ahmed Fadhel's house, until a fresh attack of illness induced the emir to restore him to his post. Even during this perturbed time, Ibn Sina persevered with his studies and teaching. Every evening, extracts from his great works, the Canon and the Sanatio, were dictated and explained to his pupils. On the death of the emir, Ibn Sina ceased to be vizier and hid himself in the house of an apothecary, where, with intense assiduity, he continued the composition of his works.

Meanwhile, he had written to Abu Ya'far, the prefect of the dynamic city of Isfahan, offering his services. The new emir of Hamadan, hearing of this correspondence and discovering where Ibn Sina was hidden, incarcerated him in a fortress. War meanwhile continued between the rulers of Isfahan and Hamadãn; in 1024 the former captured Hamadan and its towns, expelling the Tajik mercenaries. When the storm had passed, Ibn Sina returned with the emir to Hamadan, and carried on his literary labours. Later, however, accompanied by his brother, a favourite pupil, and two slaves, Ibn Sina escaped out of the city in the dress of a Sufi ascetic. After a perilous journey, they reached Isfahan, receiving an honourable welcome from the prince.

Later life and Death

The remaining ten or twelve years of Ibn Sīnā's life were spent in the service of Abu Ja'far 'Ala Addaula, whom he accompanied as physician and general literary and scientific adviser, even in his numerous campaigns.

During these years he began to study literary matters and philology, instigated, it is asserted, by criticisms on his style. He contrasts with the nobler and more intellectual character of Averroes. A severe colic, which seized him on the march of the army against Hamadan, was checked by remedies so violent that Ibn Sina could scarcely stand. On a similar occasion the disease returned; with difficulty he reached Hamadan, where, finding the disease gaining ground, he refused to keep up the regimen imposed, and resigned himself to his fate.

His friends advised him to slow down and take life moderately. He refused, however, stating that: "I prefer a short life with width to a narrow one with length". On his deathbed remorse seized him; he bestowed his goods on the poor, restored unjust gains, freed his slaves, and every third day till his death listened to the reading of the Qur'an. He died in June 1037, in his fifty-eighth year, and was buried in Hamedan, Iran.

Avicennian science

Medicine and pharmacology


The Canon of Medicine

About 100 treatises were ascribed to Ibn Sina. Some of them are tracts of a few pages, others are works extending through several volumes. The best-known amongst them, and that to which Ibn Sina owed his European reputation, is his 14-volume The Canon of Medicine, which was a standard medical text in Europe and the Islamic world up until the 18th century. The book is known for its introduction of systematic experimentation and quantification into the study of physiology, the discovery of contagious diseases and sexually transmitted diseases, the introduction of quarantine to limit the spread of infectious diseases, the introduction of experimental medicine, clinical trials, neuropsychiatry, risk factor analysis, and the idea of a syndrome in the diagnosis of specific diseases, and hypothesized the existence of microrganisms. It classifies and describes diseases, and outlines their assumed causes. Hygiene, simple and complex medicines, and functions of parts of the body are also covered. In this, Ibn Sīnā is credited as being the first to correctly document the anatomy of the human eye, along with descriptions of eye afflictions such as cataracts. It asserts that tuberculosis was contagious, which was later disputed by Europeans, but turned out to be true. It also describes the symptoms and complications of diabetes. Both forms of facial paralysis were described in-depth. In addition, the workings of the heart as a valve are described.

The Canon of Medicine was the first book dealing with experimental medicine, evidence-based medicine, randomized controlled trials, and efficacy tests, and it laid out the following rules and principles for testing the effectiveness of new drugs and medications, which still form the basis of clinical pharmacology and modern clinical trials:

  1. "The drug must be free from any extraneous accidental quality."
  2. "It must be used on a simple, not a composite, disease."
  3. "The drug must be tested with two contrary types of diseases, because sometimes a drug cures one disease by Its essential qualities and another by its accidental ones."
  4. "The quality of the drug must correspond to the strength of the disease. For example, there are some drugs whose heat is less than the coldness of certain diseases, so that they would have no effect on them."
  5. "The time of action must be observed, so that essence and accident are not confused."
  6. "The effect of the drug must be seen to occur constantly or in many cases, for if this did not happen, it was an accidental effect."
  7. "The experimentation must be done with the human body, for testing a drug on a lion or a horse might not prove anything about its effect on man."

An Arabic edition of the Canon appeared at Rome in 1593, and a Hebrew version at Naples in 1491. Of the Latin version there were about thirty editions, founded on the original translation by Gerard de Sabloneta. In the 15th century a commentary on the text of the Canon was composed. Other medical works translated into Latin are the Medicamenta Cordialia, Canticum de Medicina, and the Tractatus de Syrupo Acetoso.

It was mainly accident which determined that from the 12th to the 18th century, Ibn Sīnā should be the guide of medical study in European universities, and eclipse the names of Rhazes, Ali ibn al-Abbas and Averroes. His work is not essentially different from that of his predecessor Rhazes, because he presented the doctrine of Galen, and through Galen the doctrine of Hippocrates, modified by the system of Aristotle, as well as the Indian doctrines of Sushruta and Charaka. But the Canon of Ibn Sīnā is distinguished from the Al-Hawi (Continens) or Summary of Rhazes by its greater method, due perhaps to the logical studies of the former.

The work has been variously appreciated in subsequent ages, some regarding it as a treasury of wisdom, and others, like Averroes, holding it useful only as waste paper. In modern times it has been mainly of historic interest as most of its tenets have been disproved or expanded upon by scientific medicine. The vice of the book is excessive classification of bodily faculties, and over-subtlety in the discrimination of diseases. It includes five books; of which the first and second discuss physiology, pathology and hygiene, the third and fourth deal with the methods of treating disease, and the fifth describes the composition and preparation of remedies. This last part contains some personal observations.

He is ample in the enumeration of symptoms, and is said to be inferior in practical medicine and surgery. He introduced into medical theory the four causes of the Peripatetic system. Of natural history and botany he pretended to no special knowledge. Up to the year 1650, or thereabouts, the Canon was still used as a textbook in the universities of Leuven and Montpellier.

In the museum at Bukhara, there are displays showing many of his writings, surgical instruments from the period and paintings of patients undergoing treatment. Ibn Sīnā was interested in the effect of the mind on the body, and wrote a great deal on psychology, likely influencing Ibn Tufayl and Ibn Bajjah. He also introduced medical herbs.

Avicenna extended the theory of temperaments in The Canon of Medicine to encompass "emotional aspects, mental capacity, moral attitudes, self-awareness, movements and dreams." He summarized his version of the four humours and temperaments in a table as follows:

Avicenna's four humours and temperaments
Evidence Hot Cold Moist Dry
Functional power deficient energy deficient digestive power difficult digestion
Relation to weather worse in summer worse in winter bad in autumn

Avicennian psychology

In Muslim psychology and the neurosciences, Avicenna was a pioneer of neuropsychiatry. He first described numerous neuropsychiatric conditions, including hallucination, insomnia, mania, nightmare, melancholia, dementia, epilepsy, paralysis, stroke, vertigo and tremor.


Avicenna's legacy in classical psychology is primarily embodied in the Kitab al-nafs parts of his Kitab al-shifa' (The Book of Healing) and Kitab al-najat (The Book of Deliverance). These were known in Latin under the title De Anima (treatises "on the soul"). The main thesis of these tracts is represented in his so-called "flying man" argument, which resonates with what was centuries later entailed by Descartes's cogito argument (or what phenomenology designates as a form of an "epoche").


Astronomy and astrology

In 1070, Abu Ubayd al-Juzjani, a pupil of Ibn Sīnā, claimed that his teacher Ibn Sīnā had solved the equant problem in Ptolemy's planetary model. Also in astronomy, he criticized Aristotle's incorrect view of the stars receiving their light from the Sun. Ibn Sīnā correctly stated that the stars are self-luminous, though he believed that the planets are also self-luminous.

The study of astrology was refuted by Avicenna. His reasons were both due to the methods used by astrologers being conjectural rather than empirical and also due to the views of astrologers conflicting with orthodox Islam. He also cited passages from the Qur'an in order to justify his refutation of astrology on both scientific and religious grounds.


In chemistry, the chemical process of steam distillation was first described by Ibn Sīnā. The technique was used to produce alcohol and essential oils; the latter was fundamental to aromatherapy. He also invented the refrigerated coil, which condenses the aromatic vapours. This was a breakthrough in distillation technology and he made use of it in his steam distillation process, which requires refrigerated tubing, to produce essential oils.

As a chemist, Avicenna was one of the first to write refutations on alchemy, after al-Kindi. Four of his works on the refutation of alchemy were translated into Latin as:

  • Liber Aboali Abincine de Anima in arte Alchemiae
  • Declaratio Lapis physici Avicennae filio sui Aboali
  • Avicennae de congelatione et conglutinatione lapifum
  • Avicennae ad Hasan Regem epistola de Re recta

In one of these works, Ibn Sīnā discredited the theory of the transmutation of substances commonly believed by alchemists:

Among his works refuting alchemy, Liber Aboali Abincine de Anima in arte Alchemiae was the most influential, having influenced later medieval chemists and alchemists such as Vincent of Beauvais.

In another work, translated into Latin as De congelatione et conglutinatione lapidum, Ibn Sina proposed a four-part classification of inorganic bodies, which was a significant improvement over the two-part classification of Aristotle (into orycta and metals) and three-part classification of Galen (into terrae, lapides and metals). The four parts of Ibn Sina's classification were: lapides, sulfur, salts and metals.

Earth sciences

Ibn Sīnā wrote on Earth sciences such as geology in The Book of Healing, in which he developed the concept of uniformitarianism and law of superposition in geology. While discussing the formation of mountains, he explained:


In physics, Ibn Sīnā was the first to employ an air thermometer to measure air temperature in his scientific experiments. In 1253, a Latin text entitled Speculum Tripartitum stated the following regarding Avicenna's theory on heat:

In mechanics, Ibn Sīnā developed an elaborate theory of motion, in which he made a distinction between the inclination (tendency to motion) and force of a projectile, and concluded that motion was a result of an inclination (mayl) transferred to the projectile by the thrower, and that projectile motion in a vacuum would not cease. He viewed inclination as a permanent force whose effect is dissipated by external forces such as air resistance. His theory of motion was thus consistent with the concept of inertia in Newton's first law of motion. Ibn Sīnā also referred to mayl to as being proportional to weight times velocity, a precursor to the concept of momentum in Newton's second law of motion. Ibn Sīnā's theory of mayl was further developed by Jean Buridan in his theory of impetus.

In optics, Ibn Sina reasoned that the speed of light is finite, as he "observed that if the perception of light is due to the emission of some sort of particles by a luminous source, the speed of light must be finite. He also provided a sophisticated explanation for the rainbow phenomenon. Carl Benjamin Boyer described Ibn Sīnā's theory on the rainbow as follows:

Avicennian philosophy

Ibn Sīnā wrote extensively on early Islamic philosophy, especially the subjects logic, ethics, and metaphysics, including treatises named Logic and Metaphysics. Most of his works were written in Arabic - which was the de facto scientific language of that time, and some were written in the Persian language. Of linguistic significance even to this day are a few books that he wrote in nearly pure Persian language (particularly the Danishnamah-yi 'Ala', Philosophy for Ala' ad-Dawla'). Ibn Sīnā's commentaries on Aristotle often corrected the philosopher, encouraging a lively debate in the spirit of ijtihad.

In the medieval Islamic world, due to Avicenna's successful reconciliation between Aristotelianism and Neoplatonism along with Kalam, Avicennism eventually became the leading school of Islamic philosophy by the 12th century, with Avicenna becoming a central authority on philosophy.

Avicennism was also influential in medieval Europe, particular his doctrines on the nature of the soul and his existence-essence distinction, along with the debates and censure that they raised in scholastic Europe. This was particularly the case in Paris, where Avicennism was later proscribed in 1210. Nevertheless, his psychology and theory of knowledge influenced William of Auvergne and Albertus Magnus, while his metaphysics had an impact on the thought of Thomas Aquinas.

Metaphysical doctrine

Early Islamic philosophy, imbued as it is with Islamic theology, distinguishes more clearly than Aristotelianism the difference between essence and existence. Whereas existence is the domain of the contingent and the accidental, essence endures within a being beyond the accidental. The philosophy of Ibn Sīnā, particularly that part relating to metaphysics, owes much to al-Farabi. The search for a truly definitive Islamic philosophy can be seen in what is left to us of his work.


Avicenna’s consideration of the essence-attributes question may be elucidated in terms of his ontological analysis of the modalities of being; namely impossibility, contingency, and necessity. Avicenna argued that the impossible being is that which cannot exist, while the contingent in itself (mumkin bi-dhatihi) has the potentiality to be or not to be without entailing a contradiction. When actualized, the contingent becomes a ‘necessary existent due to what is other than itself’ (wajib al-wujud bi-ghayrihi). Thus, contingency-in-itself is potential beingness that could eventually be actualized by an external cause other than itself. The metaphysical structures of necessity and contingency are different. Necessary being due to itself (wajib al-wujud bi-dhatihi) is true in itself, while the contingent being is ‘false in itself’ and ‘true due to something else other than itself’. The necessary is the source of its own being without borrowed existence. It is what always exists. The Necessary exists ‘due-to-Its-Self’, and has no quiddity/essence (mahiyya) other than existence (wujud). Furthermore, It is ‘One’ (wahid ahad) since there cannot be more than one ‘Necessary-Existent-due-to-Itself’ without differentia (fasl) to distinguish them from each other. Yet, to require differentia entails that they exist ‘due-to-themselves’ as well as ‘due to what is other than themselves’; and this is contradictory. However, if no differentia distinguishes them from each other, then there is no sense in which these ‘Existents’ are not one and the same. Avicenna adds that the ‘Necessary-Existent-due-to-Itself’ has no genus (jins), nor a definition (hadd), nor a counterpart (nadd), nor an opposite (did), and is detached (bari’) from matter (madda), quality (kayf), quantity (kam), place (ayn), situation (wad’), and time (waqt).

Avicennian logic

Avicenna discussed the topic of logic in Islamic philosophy extensively in his works, and developed his own system of logic known as "Avicennian logic" as an alternative to Aristotelian logic. By the 12th century, Avicennian logic had replaced Aristotelian logic as the dominant system of logic in the Islamic world. After the Latin translations of the 12th century, Avicennian logic was also influential in Europe.

Ibn Sina developed an early theory on hypothetical syllogism, which formed the basis of his early risk factor analysis. He also developed an early theory on propositional calculus, which was an area of logic not covered in the Aristotelian tradition. The first criticisms of Aristotelian logic were also written by Ibn Sina, who developed an original theory on temporal modal syllogism. Ibn Sina also contributed inventively to the development of inductive logic, being the first to describe the methods of agreement, difference and concomitant variation which are critical to inductive logic and the scientific method.

Natural philosophy

Ibn Sina and Abū Rayhān al-Bīrūnī engaged in a written debate, with al-Biruni mostly criticizing Aristotelian natural philosophy and the Peripatetic school, while Avicenna and his student Ahmad ibn 'Ali al-Ma'sumi respond to al-Biruni's criticisms in writing. Al-Biruni began by asking Avicenna eighteen questions, ten of which were criticisms of Aristotle's On the Heavens.

Philosophy of science



Ibn Sīnā was a devout Muslim and sought to reconcile rational philosophy with Islamic theology. His aim was to prove the existence of God and his creation of the world scientifically and through reason and logic. Avicenna wrote a number of treatises dealing with Islamic theology. These included treatises on the Islamic prophets, whom he viewed as "inspired philosophers", and on various scientific and philosophical interpretations of the Qur'an, such as how Quranic cosmology corresponds to his own philosophical system.

Ibn Sīnā memorized the Qur'an by the age of seven, and as an adult, he wrote five treatises commenting on suras from the Qur'an. One of these texts included the Proof of Prophecies, in which he comments on several Quranic verses and holds the Qur'an in high esteem. Avicenna argued that the Islamic prophets should be considered higher than philosophers.

Thought experiments

While he was imprisoned in the castle of Fardajan near Hamadhan, Avicenna wrote his famous "Floating Man" thought experiment to demonstrate human self-awareness and the substantiality of the soul. He referred to the living human intelligence, particularly the active intellect, which he believed to be the hypostasis by which God communicates truth to the human mind and imparts order and intelligibility to nature. His "Floating Man" thought experiment tells its readers to imagine themselves suspended in the air, isolated from all sensations, which includes no sensory contact with even their own bodies. He argues that, in this scenario, one would still have self-consciousness. He thus concludes that the idea of the self is not logically dependent on any physical thing, and that the soul should not be seen in relative terms, but as a primary given, a substance.

Other contributions


In the chapters on mechanics and engineering in his encyclopedia Mi'yar al-'aql (The Measure of the Mind), Avicenna writes an analysis on the ilm al-hiyal (science of ingenious devices) and makes the first successful attempt to classify simple machines and their combinations. He first describes and illustrates the five constituent simple machines: the lever, pulley, screw, wedge, and windlass. He then analyzes all the combinations of these simple machines, such as the windlass-screw, windlass-pulley and windlass-lever for example. He is also the first to describe a mechanism which is essentially a combination of all of these simple machines (except for the wedge).


Almost half of Ibn Sīnā's works are versified. His poems appear in both Arabic and Persian. As an example, Edward Granville Browne claims that the following verses are incorrectly attributed to Omar Khayyám, and were originally written by Ibn Sīnā:

از قعر گل سیاه تا اوج زحل,
Up from Earth's Centre through the Seventh Gate

کردم همه مشکلات گیتی را حل,
I rose, and on the Throne of Saturn sate,

بیرون جستم زقید هر مکر و حیل,
And many Knots unravel'd by the Road;

هر بند گشاده شد مگر بند اجل.
But not the Master-Knot of Human Fate.

When some of his opponents blame him for blasphemy, he says

کفر چو منی گزاف و آسان نبود

The blasphemy of somebody like me is not easy and exorbitant

محکمتر از ایمان من ایمان نبود

There isn't any stronger faith than my faith

در دهر چو من یکی و آن هم کافر

If there is just one person like me in the world and that one is impious

پس در همه دهر یک مسلمان نبود

So there are no Muslims in the whole world.


As early as the 1300s when Dante Alighieri showed him experiencing a perfect eternity with some the greatest men in history in his Divine Comedy such as Virgil, Averroes, Homer, Horace, Ovid, Lucan, Socrates, Plato, and Saladin, Avicenna has been recognized by both East and West, as one of history's great figures.

George Sarton, the father of the history of science, described Ibn Sīnā as "one of the greatest thinkers and medical scholars in history" and called him "the most famous scientist of Islam and one of the most famous of all races, places, and times." He was one of the Islamic world's leading writers in the field of medicine. He was influenced by the approach of Hippocrates and Galen, as well as Sushruta and Charaka. Along with Rhazes, Abulcasis, Ibn al-Nafis, and al-Ibadi, Ibn Sīnā is considered an important compiler of early Muslim medicine. He is remembered in Western history of medicine as a major historical figure who made important contributions to medicine and the European Renaissance. Ibn Sīnā is also considered the father of the fundamental concept of momentum in physics.

In Iran, he is considered a national icon, and is often regarded as one of the greatest Persians to have ever lived. Many portraits and statues remain in Iran today. An impressive monument to the life and works of the man who is known as the 'doctor of doctors' still stands outside the Bukhara museum and his portrait hangs in the Hall of the Avicenna Faculty of Medicine in the University of Paris. There is also a crater on the moon named the Avicenna crater. Bu-Ali Sina University in Hamedan (Iran), the ibn Sīnā Tajik State Medical University in Dushanbe (The capital of the Republic of Tajikistan), Avicenna School in Karachi, Pakistan and Ibne Sina Balkh Medical School in his native province of Balkh in Afghanistan are all named in his honour.


In March 2008, it was announced that Avicenna’s name would be used for new Directories of education institutions for health care professionals, worldwide. The Avicenna Directories will list universities and schools where doctors, public health practitioners, pharmacists and others, are educated. The project team stated “Why Avicenna? Avicenna … was … noted for his synthesis of knowledge from both east and west. He has had a lasting influence on the development of medicine and health sciences. The use of Avicenna’s name symbolises the worldwide partnership that is needed for the promotion of health services of high quality.”


Scarcely any member of the Muslim circle of the sciences, including theology, philology, mathematics, astronomy, physics, and music, was left untouched by the treatises of Ibn Sīnā. This vast quantity of works - be they full-blown treatises or opuscula - vary so much in style and content (if one were to compare between the 'ahd made with his disciple Bahmanyar to uphold philosophical integrity with the Provenance and Direction, for example) that Yahya (formerly Jean) Michot has accused him of "neurological bipolarity".


Ibn Sīnā wrote at least one treatise on alchemy, but several others have been falsely attributed to him. His book on animals was translated by Michael Scot. His Logic, Metaphysics, Physics, and De Caelo, are treatises giving a synoptic view of Aristotelian doctrine, though the Metaphysics demonstrates a significant departure from the brand of Neoplatonism known as Aristotelianism in Ibn Sīnā's world; Arabic philosophers have hinted at the idea that Ibn Sīnā was attempting to "re-Aristotelianise" Muslim philosophy in its entirety, unlike his predecessors, who accepted the conflation of Platonic, Aristotelian, Neo- and Middle-Platonic works transmitted into the Muslim world.


List of Works

This is the list of some of Avicenna's well-known works:

  • Sirat al-shaykh al-ra’is (The Life of Ibn Sina), ed. and trans. WE. Gohlman, Albany, NY: State University of New York Press, 1974. (The only critical edition of Ibn Sina’s autobiography, supplemented with material from a biography by his student Abu ‘Ubayd al-Juzjani. A more recent translation of the Autobiography appears in D. Gutas, Avicenna and the Aristotelian Tradition: Introduction to Reading Avicenna’s Philosophical Works, Leiden: Brill, 1988.)
  • Al-Qanun fi’l-tibb (The Canon of Medicine), ed. I. a-Qashsh, Cairo, 1987. (Encyclopedia of medicine.)
  • Danishnama-i ‘ala’i (The Book of Scientific Knowledge), ed. and trans. P Morewedge, The Metaphysics of Avicenna, London: Routledge and Kegan Paul, 1973.
  • Kitab al-Shifa’ (The Book of Healing). (Ibn Sina’s major work on philosophy. He probably began to compose al-Shifa’ in 1014, and completed it in 1020.) Critical editions of the Arabic text have been published in Cairo, 1952-83, originally under the supervision of I. Madkour




  • Nasr, Seyyed Hossein; Oliver Leaman (1996). History of Islamic Philosophy. Routledge.
  • Nasr, Seyyed Hossein (2006). Islamic Philosophy from Its Origin to the Present: Philosophy in the Land of prophecy. SUNY Press.
  • Von Dehsen, Christian D.; Scott L. Harris (1999). Philosophers and religious leaders. Greenwood Press. Encyclopedia
  • Avicenna. In Encyclopedia Britannica Online (2007). Retrieved on 2007-11-05..
  • Islam. In Encyclopedia Britannica Online (2007). Retrieved on 2007-11-27..

Further reading

  • A good introduction to his life and philosophical thought is Avicenna by Lenn E. Goodman (Cornell University Press: 1992, updated edition 2006)
  • For Ibn Sina's life, see Ibn Khallikan's Biographical Dictionary, translated by de Slane (1842); F. Wüstenfeld's Geschichte der arabischen Aerzte und Naturforscher (Gottingen, 1840).
  • Shahrastani, German translation, vol. ii. 213-332
  • For an overview of his career see Shams Inati, "Ibn Sina" in History of Islamic Philosophy, ed. Hossein Seyyed Nasr and Oliver Leaman, New York: Routledge (1996).
  • Nader El-Bizri, "Being and Necessity: A Phenomenological Investigation of Avicenna’s Metaphysics and Cosmology," in Islamic Philosophy and Occidental Phenomenology on the Perennial Issue of Microcosm and Macrocosm, ed. Anna-Teresa Tymieniecka (Dordrecht: Kluwer Academic Publishers, 2006), pp. 243-261
  • Nader El-Bizri, "Avicenna’s De Anima between Aristotle and Husserl," in The Passions of the Soul in the Metamorphosis of Becoming, ed. Anna-Teresa Tymieniecka (Dordrecht: Kluwer Academic Publishers, 2003), pp. 67-89
  • For his medicine, see:
  • Sprengel, Histoire de la Medicine
  • Edward G. Browne, Islamic Medicine, 2002, Goodword Pub., ISBN 81-87570-19-9
  • For his philosophy, see:
  • Michot, Jean R., La destinée de l'homme selon Avicenne (Leuven: Peeters, 1986) ISBN 90-6381-071-2.
  • Dimitri Gutas, "Avicenna and the Aristotelian Tradition: Introduction to Reading Avicenna's Philosophical Works" (Leiden: Brill 1988)
  • Reisman, David C. (ed.), "Before and After Avicenna: Proceedings of the First Conference of the Avicenna Study Group" (Leiden: Brill 2003)
  • The Cambridge Companion to Arabic Philosophy, edited by P. Adamson and R. Taylor, (Cambridge: Cambridge: University Press 2005)
  • Amos Bertolacci, The reception of Aristotle's Metaphysics in Avicenna's Kitab al-Sifa'. A milestone of Western metaphysical thought (Leiden: Brill 2006)
  • Avicenne: Réfutation de l'astrologie. Edition et traduction du texte arabe, introduction, notes et lexique par Yahya Michot. Préface d'Elizabeth Teissier (Beirut-Paris: Albouraq, 2006) ISBN 2-84161-304-6.
  • Shoja MM, Tubbs RS. The disorder of love in the Canon of Avicenna (A.D. 980-1037). Am J Psychiatry 2007; 164:228–229.

External links

See also

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