“And for things sprung from earth, they must
Return unto their parent dust,
While those from heavenly seed which rise
Are borne uplifted to the skies.
Nought that has once existed dies,
Though often what has been combined
Before, we separated find,
Invested with another Form.”{9}{a fragment from the Chryssipus of Euripides.}
(31) And this law and ordinance is established with reference to everything which is destroyed, that wherever composite things are existing in combination they are thrown into disorder instead of into the order in accordance with nature, which they previously enjoyed, and they are removed to situations opposite to those in which they were previously placed, so that they seem in a manner to be sojourners; and when they are dissolved again, then they return to the appropriate parts allotted to them by nature.
VII. (32) But since the world has no participation in that irregularity which exists in the things which I have just been mentioning, let us stop awhile and consider this point. If the world were liable to corruption and destruction, it follows of necessity that all its parts would at present be arranged in a position not in accordance with nature: but it is impious even to imagine such a thing as this; for all the parts of the world have received the most excellent position possible, and an arrangement of the purest symmetry and harmony; so that each individual part, being content with its place as a native country to it, does not seek any change for the better. (33) On this account it is that the most central position of all has been assigned to the earth, to which all things belonging to it adhere, and to which they descend again even if you throw them into the air: and this is a proof that their place is in accordance with nature; for wherever anything is borne without any violence, and where it then remains firm and stationary, that is clearly its natural place. And then, in the second place, water was poured over the earth, and air and fire have gone from the central to the upper part, air having received for its portion the region which is on the borders between air and fire, and fire having received the highest place of all: on which account, if you light a torch and press it down towards the ground, nevertheless the flame will still turn in a contrary direction, and lightening itself in accordance with the natural motion of fire, will rise upwards: (34) if, then, motion contrary to nature is the cause of corruptibility and destruction in the case of other animals, but if in the case of the world every one of its parts is arranged in complete accordance with nature, having had appropriate positions allotted to each of them, then surely the world must most justly be pronounced incorruptible and imperishable. (35) Moreover this point is manifest to every one, that every nature is desirous to keep and preserve, and if it were possible to make immortal, everything of which it is the nature; the nature of trees, for instance, desires to preserve trees, and the nature of animals desires to preserve each individual animal. (36) But particular nature is of necessity unable to conduct what it belongs to to eternity; for want, or heat, or cold, or innumerable other ordinary circumstances, when they affect particular things, shake them and dissolve the bond which previously held them together, and at last break them to pieces; but if nothing resembling any of these things were lying in wait outside, then in that case nature itself, as far as it is possible, would preserve everything both great and small free from old age. (37) It follows therefore of necessity, that the nature of the world must desire the durability of the universe; for it is not worse than particular natures, so that it should run away and desert its proper duties, and attempt to produce disease instead of health, and corruption and destruction instead of complete safety, since, —
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