"It is on the strength of such circumstantial evidence -- that of reason and logic -- that we affirm that, if Egypt furnished Greece with her civilization, and the latter bequeathed hers to Rome, Egypt herself had, in those unknown ages when Menes reigned,** received her laws, her social institutions, her arts and her sciences, from pre-Vedic India; and that therefore, it is in that old initiation of the priests -- adepts of all the other countries -- we must seek for the key to the great mysteries of humanity."
January 1, 1970
https://en.wikiquote.org/wiki/Egypt%E2%80%93India_relations