By Proposition 33 the cause to which it reverts must therefore be itself. All that is capable of reverting upon itself is incorporeal. For it is not in the nature of any body to revert upon itself. It is not in the nature, then, of any body to revert upon itself so that the whole is reverted upon the whole. Thus if there is anything which is capable of reverting upon itself, it is incorporeal and without parts.
Conjunction is only possible where parts are immediately adjacent.
Parts more distant are not conjoined. As corporeal bodies are composed of parts located at various distances from one another, those parts cannot wholly conjoin. Unfortunately, self-reversion requires just such a union. All that is capable of reverting upon itself has an existence separable from all body. Anything, therefore, which is inseparable in its existence is to the same or an ever greater degree inseparable in its activity.