Of Living Creatures, of Man; Prometheus, Deucalion, the ParcÆ
For all things must necessarily be comprised in three periods of time— the past, the present, and the future. The commencement belongs to the past, existence to the present, dissolution to the future. And all these things are seen in the case of men individually: for we begin when we are born; and we exist while we live; and we cease when we die. On which account they would have it that there are three Parcæ: one who warps the web of life for men; the second, who weaves it; the third, who cuts and finishes it.
But in the whole race of men, because the present time only is seen, yet from it the past also, that is, the commencement, and the future, that is, the dissolution, are inferred. For since it exists, it is evident that at some time it began to exist, for nothing can exist without a beginning; and because it had a beginning, it is evident that it will at some time have an end. For that cannot, as a whole, be immortal, which consists of mortals. For as we all die individually, it is possible that, by some calamity, all may perish simultaneously: either through the unproductiveness of the earth, which sometimes happens in particular cases; or through the general spread of pestilence, which often desolates separate cities and countries; or by the conflagration of the world, as is said to have happened in the case of Phaethon; or by a deluge, as is reported in the time of Deucalion, when the whole race was destroyed with the exception of one man.
And if this deluge happened by chance, it might assuredly have happened that he who was the only survivor should perish. But if he was reserved by the will of divine providence, as it cannot be denied, to recruit mankind, it is evident that the life and the destruction of the human race are in the power of God. And if it is possible for it to die altogether, because it dies in parts, it is evident that it had an origin at some time; and as the liability to decay bespeaks a beginning, so also it gives proof of an end.
And if these things are true, Aristotle will be unable to maintain that the world also itself had no beginning. But if Plato and Epicurus extort this from Aristotle, yet Plato and Aristotle, who thought that the world would be everlasting, will, notwithstanding their eloquence, be deprived of this also by Epicurus, because it follows, that, as it had a beginning, it must also have an end. But we will speak of these things at greater length in the last book. Now let us revert to the origin of man.
Source: The Divine Institutes (New Advent)