In the same way the word 'generated' is used, first, where what formerly was not afterwards is, whether a process of becoming was or was not involved, so long as that which then was not, now is; secondly, of anything capable of existing, 'capable' being defined with reference either to truth or to facility; thirdly, of anything to which the passage from not being to being belongs, whether already actual, if its existence is due to a process of becoming, or not yet actual but possible.