Ambrose of Milan

But on the contrary, if your eye has looked upon a woman to covet her, you have opened a wound, you have driven a weapon into your body. Your very members become tools of sin. If you look upon the property of orphans and drive them from the dwellings of their fathers, you are changing the landmarks that your forefathers set. Your members are tools of iniquity. And so the passions are the author of guilt and not the flesh, for the flesh is the servant of the will.

On Jacob and the Blessed Life ↗