Lactantius — Divine Institutes 7.12

Now let us refute the arguments of those who maintain the opposite opinions, which Lucretius has related in his third book. Since, he says, the soul is born together with the body, it must necessarily die with the body. But the two cases are not similar. For the body is solid, and capable of being grasped both by the eyes and the hand; but the soul is slight, and eluding the touch and sight. The body is formed from the earth, and made firm; the soul has in it nothing concrete, nothing of earthly weight, as Plato maintained. For it could not have such great force, such great skill, such great rapidity, unless it derived its origin from heaven.

The body, therefore, since it is made up of a ponderous and corruptible element, and is tangible and visible, is corrupted and dies; nor is it able to repel violence , because it comes under the sight and under the touch; but the soul , which by its slightness avoids all touch, can be dissolved by no attack. Therefore, although they are joined and connected together from birth, and the one which is formed of earthly material is, as it were, the vessel of the other, which is drawn out from heavenly fineness, when any violence has separated the two, which separation is called death, then each returns into its own nature; that which was of earth is resolved into earth; that which is of heavenly breath remains fixed, and flourishes always, since the divine spirit is everlasting.

In fine, the same Lucretius, forgetting what he asserted, and what dogma he defended, wrote these verses: — That also which before was from the earth passes back into the earth, and that which was sent from the borders of ether is carried again by the quarters of heaven. But this language was not for him to employ, who contended that souls perished with the bodies; but he was overcome by the truth , and the true system stole upon him unawares. Moreover, that very inference which he draws, that the soul suffers dissolution, that is, that it perishes together with the body, since they are produced together, is both false, and is capable of being turned to the opposite direction.

For the body does not perish together with the soul ; but when the soul departs it remains entire for many days, and frequently by medical preparations it remains entire for a very long time. For if they both perished together, as they are produced together, the soul would not hastily depart and desert the body, but both would be dispersed alike at one point of time; and the body also, while the breath still remained in it, would dissolve and perish as quickly as the soul departs: yes, truly , the body, being dissolved, the soul would vanish, as moisture poured forth from a broken vessel. For if the earthly and frail body after the departure of the soul does not immediately flow away and waste into earth, from which it has its origin, therefore the soul , which is not frail, endures to eternity , since its origin is eternal .