"To whatever physical race or races they [the Aryans] belonged, they must have possessed a certain spiritual unity reflected in and conditioned by their community of speech. To their linguistic heirs, they bequeathed, if not skull types and bodily characteristics, at least something of this more subtle and more precious spiritual identity... [T]he Aryans must have been gifted with exceptional mental endowments, if not in enjoyment of a high material culture."