Though its fame is much restricted by its specialized nature, there is no doubt that Panini's grammar is one of the greatest intellectual achievements of any ancient civilization, and the most detailed and scientific grammar composed before the 19th century in any part of the world.
Professor A. L. Basham in: Daya Kishan Thussu Communicating India's Soft Power: Buddha to Bollywood, Palgrave Macmillan, 24 October 2013, p. 47.