2 For as it was not possible that the man who had once for all been conquered, and who had been destroyed through disobedience, could reform himself, and obtain the prize of victory; and as it was also impossible that he could attain to salvation who had fallen under the power of sin—the Son effected both these things, being the Word of God, descending from the Father, becoming incarnate, stooping low, even to death, and consummating the arranged plan of our salvation, upon whom [Paul], exhorting us unhesitatingly to believe, again says, “Who shall ascend into heaven?
That is, to bring down Christ; or who shall descend into the deep? That is, to liberate Christ again from the dead.” Then he continues, “If you shall confess with your mouth the Lord Jesus, and shall believe in your heart that God has raised Him from the dead, you shall be saved.” And he renders the reason why the Son of God did these things, saying, “For to this end Christ both lived, and died, and revived, that He might rule over the living and the dead.” And again, writing to the Corinthians, he declares, “But we preach Christ Jesus crucified;” and adds, “The cup of blessing which we bless, is it not the communion of the blood of Christ?”
Source: Adversus haereses (New Advent)