The Nature of Non-Being

We say that neither is anything generated from being, nor is being generated except according to accident. We likewise assert that this takes place after the same manner as if animal should be generated from animal and a certain animal, from a certain animal. But we do not subvert the assertion that everything is or is not. This therefore is one mode of solving the doubt. Another mode is this, that the same things may be predicated according to capacity and according to energy. The doubts are solved through which the ancients were compelled to subvert some of the above-mentioned particulars.