[74] [cap.15] [Yonge. 10] And in addition to this he says, that there are three causes of death to living animals, besides the external causes which may affect them, namely, disease, old age, and want, by no one of which is the world liable to be attacked or subdued, for that it is composed of entire elements, since there is no part of them which is left out or which remains at liberty, so that any violence can be offered to it, and it also is superior to those powers from which diseases arise; and they yielding keep the world free from all disease, and free from old age, and in a state of the most perfect self-sufficiency as to all its requirements, and without need of anything, since there is nothing wanting to it which can possibly contribute to its durability, and wholly exempt from all successions and alternations of fulness and emptiness, which animals being subject to by reason of their unregulated insatiability, bring upon themselves death instead of life, or, to speak more accurately, a life which is more pitiable than any destruction.