You wouldn't consider all the bipeds you pass on the street human beings simply because they walk upright and carry their young in their bellies nine months! It is obvious how many of them are fish or sheep, worms or angels, how many are ants, how many are fish or sheep, worms or angels, how contains the possibility of becoming human, partially even by learning to make himself conscious of them; only in this respect are these possibilities his.

Ernest Hemingway, Knut Hamsun [and] Hermann Hesse (ed. 1971)