 It shall be the duty of the Union to promote the spread of the Hindi language, to develop it so that it may serve as a medium of expression for all the elements of the composite culture of India and to secure its enrichment by assimilating without interfering with its genius, the forms, style and expressions used in Hindustani and in the other languages of India specified in the Eighth Schedule, and by drawing, wherever necessary or desirable, for its vocabulary, primarily on Sanskrit and secondarily on other languages.It was envisioned that Hindi would become the sole working language of the Union Government by 1965 (per directives in Article 344 (2) and Article 351), with state governments being free to function in the language of their own choice.However, widespread resistance to the imposition of Hindi on non-native speakers, especially in South India (such as the those in Tamil Nadu) led to the passage of the Official Languages Act of 1963, which provided for the continued use of English indefinitely for all official purposes, although the constitutional directive for the Union Government to encourage the spread of Hindi was retained and has strongly influenced its policies.