Special Provisions
The Union has a duty to promote Hindi's spread, develop it as a medium of expression for all elements of India's composite culture, and enrich it by assimilating (without disturbing its essential character) forms/style/expressions from Hindustani and other Eighth Schedule languages - drawing on Sanskrit primarily, and other languages secondarily, for vocabulary.
This gives the Union government an affirmative constitutional duty to actively develop and promote Hindi - not just as a bureaucratic official language, but as a genuinely enriched language that authentically reflects and absorbs India's broader linguistic and cultural diversity, rather than developing in isolation from the country's other languages.
This is the constitutional basis for government bodies like the Central Hindi Directorate, which work on standardising terminology, promoting Hindi usage, and encouraging the kind of cross-linguistic vocabulary enrichment this article specifically envisions.