Gregory the Great
Catena Aurea · Lukasevangelium 3
Then said he to the multitude that came forth to be baptized of him, O generation of vipers, who hath warned you to flee from the wrath to come? Bring forth therefore fruits worthy of repentance, and begin not to say within yourselves, We have Abraham to our father: for I say unto you, That God is able of these stones to raise up children unto Abraham. And now also the axe is laid unto the root of the trees: every tree therefore which bringeth not forth good fruit is hewn down, and cast into the fire,
(ubi sup.) He warns them that they must bring forth not only the fruits of repentance, but fruits worthy of repentance. For he that has violated no law, to him it is permitted to use what is lawful, but if a man has fallen into sin, he ought so to cut himself off from what is lawful, as he remembers to have committed what is unlawful. For the fruit of good works ought not to be equal in the man who has sinned less, and the man who has sinned more, nor in him who has fallen into no crimes, and him who has fallen into some. In this way it is adapted to the conscience of each man, that they should seek for so much the greater blessing on good works through repentance, as they have by guilt brought on themselves the heavier penalties.