Moreover the law entered, that the offense might abound. But where sin abounded, grace did much more abound:
All Commentaries on Romans 5:20 Go To Romans 5
Ambrose of Milan
AD 397
Sin abounded by the law because through the law came knowledge of sin, and it became harmful for me to know what through my weakness I could not avoid. It is good to know beforehand what one is to avoid, but if I cannot avoid something, it is harmful to have known about it. Thus was the law changed to its opposite, yet it became useful to me by the very increase of sin, for I was humbled.