XIII. (69) We have now then discussed at sufficient length the nonsense in opposition to truth which is uttered by those who build up falsehood and fables. But we must be well assured that men have from all eternity sprung from other men in constant succession, the man implanting the seed in the woman as in a field, and the woman receiving the seed so as to preserve it, and nature by her unseen operations fashioning everything, and each separate part of the body and of the soul, and giving to the whole race of mankind that which each individual separately is unable to receive, namely, the principle of immortality; for though the individual members are continually perishing, yet the race remains undying as a truly divine work. But if man, who is but a small portion of the universe, is eternal, then certainly the world itself must have been uncreated so as to be imperishable.