does not reciprocate, (for not every non-entity is generated,) yet, nevertheless, non-entity is not the genus of what is being generated, for simply non-entity has no species. About genus then, we must carry on the discussion, as we have stated.
BOOK V.
Chapter 1
Whether what is asserted be property or not property, must be examined through these (places).
Property is assigned either per se and always, or with relation to something else and sometimes, as the property of man per se is an animal naturally mild, but in relation to something else, as of the soul to the body, that the one commands, but the other obeys; always, as of God to be an immortal animal, but sometimes, as of a certain person to walk in the Gymnasium.
Nevertheless, the property assigned with reference to something else produces either two or four problems. For if it is affirmed of one thing, but the same denied of another, two problems only arise, as of man with regard to horse, the property is that he is a biped. For that man is not a biped may be argued by some one, also that a horse is a biped, and in both ways the property may be removed. But if each is affirmed of each, and denied of each, there will be four problems, as the property of man with reference to horse is that the former is biped, but the latter quadruped, for that man is not a biped and that he is naturally a quadruped may be argued, and that a horse is a biped and not a quadruped is capable of argument, in whatever way therefore it is shown, the proposition is subverted.
That indeed is property per se, which is attributed to all, and separates from every thing, as of man to be a mortal animal capable of science.
