1 It was necessary, therefore, that the Lord, coming to the lost sheep, and making recapitulation of so comprehensive a dispensation, and seeking after His own handiwork, should save that very man who had been created after His image and likeness, that is, Adam, filling up the times of His condemnation, which had been incurred through disobedience—[times] “which the Father had placed in His own power.” [This was necessary,] too, inasmuch as the whole economy of salvation regarding man came to pass according to the good pleasure of the Father, in order that God might not be conquered, nor His wisdom lessened, [in the estimation of His creatures.] For if man, who had been created by God that he might live, after losing life, through being injured by the serpent that had corrupted him, should not any more return to life, but should be utterly [and for ever] abandoned to death, God would [in that case] have been conquered, and the wickedness of the serpent would have prevailed over the will of God.
But inasmuch as God is invincible and long-suffering, He did indeed show Himself to be long-suffering in the matter of the correction of man and the probation of all, as I have already observed; and by means of the second man did He bind the strong man, and spoiled his goods, and abolished death, vivifying that man who had been in a state of death. For at the first Adam became a vessel in his (Satan's) possession, whom he did also hold under his power, that is, by bringing sin on him iniquitously, and under colour of immortality entailing death upon him.
For, while promising that they should be as gods, which was in no way possible for him to be, he wrought death in them: wherefore he who had led man captive, was justly captured in his turn by God; but man, who had been led captive, was loosed from the bonds of condemnation.
Source: Adversus haereses (New Advent)