Lucius Caecilius Firmianus Lactantius

In his own words on 1 Thessalonians

• 1 Thessalonians 4:14

  Therefore God discharged the office of a true father. He Himself formed the body; He Himself infused the soul with which we breathe. Whatever we are, it is altogether His work. In what manner He effected this He would have taught us, if it were right for us to know; as He taught us other things, which have conveyed to us the knowledge both of ancient error and of true light. Man, therefore, was made from different and opposite substances, as the world itself was made from light and darkness, from life and death; and he has admonished us that these two things contend against each other in man: so that if the soul, which has its origin from God, gains the mastery, it is immortal, and lives in perpetual light; if, on the other hand, the body shall overpower the soul, and subject it to its dominion, it is in everlasting darkness and death. And the force of this is not that it altogether annihilates the souls of the unrighteous, but subjects them to everlasting punishment. We term that punishment the second death, which is itself also perpetual, as also is immortality. We thus define the first death: Death is the dissolution of the nature of living beings; or thus: Death is the separation of body and soul. But we thus define the second death: Death is the suffering of eternal pain; or thus: Death is the condemnation of souls for their deserts to eternal punishments.

  The Divine Institutes, Book 2, Chapter XIII