I have declared again and again that if I say Aryans, I mean neither blood nor bones, nor hair nor skull; I mean simply those who speak an Aryan language… in that sense, and in that sense only, do I say that even the blackest Hindus represent an earlier stage of Aryan speech and thought than the fairest Scandinavians... To me an ethnologist who speaks of Aryan race, Aryan blood, Aryan eyes and hair, is as great a sinner as a linguist who speaks of a dolichocephalic dictionary or a brachycephalic grammar.

Biographies of Words and the Home of the Aryas (1888)