As capacity is used in so many ways, the capable in one sense will mean that which can begin a movement (or a change in general, for even that which can bring things to rest is a capable thing) in another thing or in itself qua other; and in one sense that over which something else has such a capacity; and in one sense that which has a capacity of changing into something, whether for the worse or for the better (for even that which perishes is thought to be capable of perishing, for it would not have perished if it has not been capable of it; but, as a matter of fact, it has a certain disposition and cause and principle which fits it to suffer this; sometimes it is thought to be of this sort because it has something, sometimes because it is deprived of something; but if privation is in a sense having, everything will be capable by having something, so that things are capable both by having something, ie a principle, and by having the privation of the positive principle, if it is possible to have a privation; and if privation is not in a sense having, things are called capable homonymously); and a thing is capable in another sense because neither any other thing, nor itself qua other, has a capacity or principle which can destroy it.