Know that the difficulties which lead to confusion in the question what is the purpose of the Universe or of any of its parts, arise from two causes: first, man has an erroneous idea of himself, and believes that the whole world exists only for his sake; secondly, he is ignorant both about the nature of the sublunary world, and about the Creator's intention to give existence to all beings whose existence is possible, because existence is undoubtedly good.
It is of great advantage that man should know his station, and not imagine that the whole universe exists only for him.
The error of the ignorant goes so far as to say that God's power is insufficient, because he has given to this Universe the properties which they imagine cause these great evils, and which do not help all evil-disposed persons to obtain the evil which they seek, and to bring their evil souls to the aim of their desires, though these, as we have shown, are really without limit.
You will find that there is no other difference of opinion as regards any portions of the Universe, except that the philosophers believe in the Eternity of the Universe and we believe in the Creation. Note this.
Even the existence of this corporeal element, low as it in reality is, because it is the source of death and all evils, is likewise good for the permanence of the Universe and the continuation of the order of things, so that one thing departs and the other succeeds.
First Theory. There is no Providence at all for anything in the Universe; all parts of the Universe, the heavens and what they contain, owe their origin to accident and chance; there exists no being that rules and governs them or provides for them. This is the theory of Epicurus.