Amid all the praise for Sanskrit, let me also present a detraction. No doubt there is an enormous amount of great, epic quality literature in Sanskrit along with tomes of high quality spiritual thought. However many Sanskrit learners have complained about the difficulty of its grammar. Many, many hours have to be spent memorizing the rules. A true Sanskrit scholar has to devote several years to the mastery of the language. I think the difficulty of the language also promoted class distinction in India. Only a selected group of people could effectively use it. The rest fell back to Prakrit, Pali (and later Hindi) and were demoted in the social hierarchy. Compare this to Hindi, Tamil or English. Even auto wallahs in the appropriate regions can converse in these languages.