Further, if there is a substance or principle of such a nature as that which we are now seeking, and if this is one for all things, and the same for eternal and for perishable things, it is hard to say why in the world, if there is the same principle, some of the things that fall under the principle are eternal, and others are not eternal; this is paradoxical.
Gainera, bilatzen ari garen substantzia eta printzipio hauek bezalakorik baldin badago naturaz-hau gauza guztietarako printzipio bakarra eta betiereko diren gauzetarako eta ustelgarri direnetarako 30) printzipio bera izanik-, aporia hau sortzen da: