Tertullian

“ Death is one thing, and mortality is another. It is one thing for death to be swallowed up, and another thing for mortality to be swallowed up. Death is incapable of immortality, but not so mortality. ”

“ The truth is, when it is written, “This mortal must put on immortality,” [2] it is explained in what sense it is that “mortality is swallowed up of life”—even whilst, clothed with immortality, it is hidden and concealed, and contained within it, not as consumed, and destroyed, and lost. But death, you will say in reply to me, at this rate, must be safe, even when it has been swallowed up. ”

“ For the rest, it is only just and right that death should be swallowed up in utter destruction, since it does itself devour with this same intent. Death, says the apostle, has devoured by exercising its strength, and therefore has been itself devoured in the struggle “swallowed up in victory.” [4] “O death, where is thy sting? O death, where is thy victory?” [5] Therefore life, too, as the great antagonist of death, will in the struggle swallow up for salvation what death, in its struggle, had swallowed up for destruction. ”