Things, then, that are called complete in virtue of their own nature are so called in all these senses, some because they lack nothing (∆) in respect of goodness and cannot be excelled and no part proper to them can be found outside, others in general because they cannot be exceeded in their several classes and no part proper to them is outside; the others are so called in virtue of these first two kinds, because they either make or have something of the sort or are adapted to it or in some way or other are referred to the things that are called complete in the primary sense.