Hippolytus

“ Aristotle primarily, and especially, and preeminently entitles this—substance, inasmuch as it cannot either be predicated of any Subject, or exist in a Subject. He, however, predicates of the Subject, just as with the genus, what I said constituted animality, (and which is) predicated by means of a common name of all particular animals, such as ox, horse, and the rest that are placed under (this genus) . For it is true to say that man is an animal, and horse an animal, and that ox is an animal, and each of the rest. ”

“ For neither does horse nor ox differ from man so far forth as he is an animal, for the definition of animal is said to suit all animals alike. For what is an animal? If we define it, a general definition will comprehend all animals. For animal is an animated Substance, endued with Sensation. ”