Sanskrit is the mother of all languages; there is no doubt about it. In our childhood, we read one grammar made by two English professors, Mr. Rowe and Webb, in Calcutta, Presidential College, and they have given their statement that Sanskrit is the mother of all languages. Besides that, we understand from reliable resources, that Sanskrit is the spoken by the higher planetary denizens. It is therefore called Devanagari. Devanagari means the cities of the demigods. This language is spoken there. And so far, AUM is concerned, actually, the AU, the alphabet A, is the basic principle of all languages. And Krishna says, aksaranan akarasmi, the A amongst all alphabets, is Krishna. Because A is the beginning of all language. A or Au. So your representation that Sanskrit is the origin of Indo-European languages, is quite right, but our main concern is how we can impress people about the importance of Krishna Consciousness.
Letter to Hayagriva, 7 October, 1968