If souls continue to exist, how does the air contain them from eternity?- But how does the earth contain the bodies of those who have been buried from time so remote? For as here the mutation of these bodies after a certain continuance, whatever it may be, and their dissolution make room for other dead bodies; so the souls which are removed into the air after subsisting for some time are transmuted and diffused, and assume a fiery nature by being received into the seminal intelligence of the universe, and in this way make room for the fresh souls which come to dwell there. And this is the answer which a man might give on the hypothesis of souls continuing to exist. But we must not only think of the number of bodies which are thus buried, but also of the number of animals which are daily eaten by us and the other animals. For what a number is consumed, and thus in a manner buried in the bodies of those who feed on them! And nevertheless this earth receives them by reason of the changes of these bodies into blood, and the transformations into the aerial or the fiery element.
Observe constantly that all things take place by change, and accustom thyself to consider that the nature of the Universe loves nothing so much as to change the things which are and to make new things like them. For everything that exists is in a manner the seed of that which will be. But thou art thinking only of seeds which are cast into the earth or into a womb: but this is a very vulgar notion.
Always remember the saying of Heraclitus, that the death of earth is to become water, and the death of water is to become air, and the death of air is to become fire, and reversely. And think too of him who forgets whither the way leads, and that men quarrel with that with which they are most constantly in communion, the reason which governs the universe; and the things which daily meet with seem to them strange: and consider that we ought not to act and speak as if we were asleep, for even in sleep we seem to act and speak; and that we ought not, like children who learn from their parents, simply to act and speak as we have been taught.
I go through the things which happen according to nature until I shall fall and rest, breathing out my breath into that element out of which I daily draw it in, and falling upon that earth out of which my father collected the seed, and my mother the blood, and my nurse the milk; out of which during so many years I have been supplied with food and drink; which bears me when I tread on it and abuse it for so many purposes.
That which has grown from the earth to the earth, But that which has sprung from heavenly seed, Back to the heavenly realms returns. This is either a dissolution of the mutual involution of the atoms, or a similar dispersion of the unsentient elements.
Short-lived are both the praiser and the praised, and the rememberer and the remembered: and all this in a nook of this part of the world; and not even here do all agree, no, not any one with himself: and the whole earth too is a point.
Among the animals which have not reason one life is distributed; but among reasonable animals one intelligent soul is distributed: just as there is one earth of all things which are of an earthy nature, and we see by one light, and breathe one air, all of us that have the faculty of vision and all that have life.
All things which participate in anything which is common to them all move towards that which is of the same kind with themselves. Everything which is earthy turns towards the earth, everything which is liquid flows together, and everything which is of an aerial kind does the same, so that they require something to keep them asunder, and the application of force. Fire indeed moves upwards on account of the elemental fire, but it is so ready to be kindled together with all the fire which is here, that even every substance which is somewhat dry, is easily ignited, because there is less mingled with it of that which is a hindrance to ignition. Accordingly then everything also which participates in the common intelligent nature moves in like manner towards that which is of the same kind with itself, or moves even more.
Soon will the earth cover us all: then the earth, too, will change, and the things also which result from change will continue to change for ever, and these again for ever. For if a man reflects on the changes and transformations which follow one another like wave after wave and their rapidity, he will despise everything which is perishable.
"The earth loves the shower"; and "the solemn aether loves": and the universe loves to make whatever is about to be. I say then to the universe, that I love as thou lovest. And is not this too said, that "this or that loves (is wont) to be produced"?