ow, just as nothing suffers save by reason of a passive power, so nothing acts except by reason of the first act, namely the form. For it has been stated that this first act is so called from action. Now God is act both pure and primary, wherefore it is most befitting to him to act and communicate his likeness to other things: and consequently active power is most becoming to him: since power is called active forasmuch as it is a principle of action. We must also observe that our mind strives to describe God as a most perfect being. And seeing that it is unable to get at him save by likening him to his effects, while it fails to find any creature so supremely perfect as to be wholly devoid of imperfection, consequently it endeavours to describe him as possessing the various perfections it discovers in creatures, although each of those perfections is in some way at fault, yet so as to remove, from God whatever imperfection is connected with them.