7 My view is, that the Lord is for falling and rising again, not because some fall and others rise again, but because in us the worst falls and the better is set up. The advent of the Lord is destructive of our bodily affections and it rouses the proper qualities of the soul. As when Paul says, “When I am weak, then I am strong,” the same man is weak and is strong, but he is weak in the flesh and strong in the spirit. Thus the Lord does not give to some occasions of falling and to others occasions of rising.
Those who fall, fall from the station in which they once were, but it is plain that the faithless man never stands, but is always dragged along the ground with the serpent whom he follows. He has then nowhere to fall from, because he has already been cast down by his unbelief. Wherefore the first boon is, that he who stands in his sin should fall and die, and then should live in righteousness and rise, both of which graces our faith in Christ confers on us. Let the worse fall that the better may have opportunity to rise. If fornication fall not, chastity does not rise. Unless our unreason be crushed our reason will not come to perfection. In this sense he is for the fall and rising again of many.
Source: Letters (New Advent)