2.25 अव्यक्तः unmanifested, अयम् this (Self), अचिन्त्यः unthinkable, अयम् this, अविकार्यः unchangeable, अयम् this, उच्यते is said, तस्मात् therefore, एवम् thus, विदित्वा having known, एनम् this, न not, अनुशोचितुम् to grieve, अर्हसि (thou) oughtest.Commentary: The Self is not an object of perception. It can hardly be seen by the physical eyes. Therefore, the Self is unmanifested. That which is seen by the eyes becomes an object of thought. As the Self cannot be perceived by the eyes, It is unthinkable. Milk when mixed with buttermilk changes its form. The Self cannot change Its form like milk. Hence, It is changeless and immutable. Therefore, thus understanding the Self, thou shouldst not mourn. Thou shouldst not think also that thou art their slayer and that they are killed by thee.