One more reference:
The fact is that the Rigveda represents a very pristine state of Indo-European language and religion. Griffith describes it as follows in his preface to his translation: “As in its original language we see the roots and shoots of the languages of Greek and Latin, of Kelt, Teuton and Slavonian, so the deities, the myths and the religious beliefs and practices of the Veda throw a flood of light upon the religions of all European countries before the introduction of Christianity.
