Congrès international des orientalistes, Transactions of the second session of the international Congress of Orientalists… (1876)
“ All human knowledge begins with the Two or the Dyad, the comprehension of two single things as one. If we may still quote Aristotle, we may boldly say that" there is no science of that which is unique." A single event may be purely accidental, it comes and goes, it is inexplicable, it does not call for an explanation. But as soon as the same fact is repeated, the work of comparison begins, and the first step is made in that wonderful process which we call generalisation, and which is at the root of all intellectual knowledge and of all intellectual language. ”
