Ambrose of Milan

Thou hadst learnt by what went before not to be occupied by the business of this world, not to prefer transitory things to eternal. But because the frailty of man can not keep a firm step in so slippery a world, the good Physician has shown thee a remedy even after falling; the merciful Judge has not denied the hope of pardon; hence it is added, Then drew near unto him all the publicans.

Catena Aurea by Aquinas ↗

Gregory the Dialogist

From which we may gather, that true justice feels compassion, false justice scorn, although the just are wont rightly to repel sinners. But there is one act proceeding from the swelling of pride, another from the zeal for discipline. For the just, though without they spare not rebukes for the sake of discipline, within cherish sweetness from charity. In their own minds they set above themselves those whom they correct, whereby they keep both them under by discipline, and themselves by humility.

Catena Aurea by Aquinas ↗

Bede

But the tax collectors and sinners were approaching him to hear him, and the Pharisees and scribes murmured, saying, "This man receives sinners and eats with them." Because not only can the righteous sin through inertia, but also the sinner can repent through diligence, after it is narrated that the tasteless salt must be cast outside, immediately a group of penitents is described being admitted within, who, approaching to hear the word of God, were received not only for conversation but also for dining together. …

On the Gospel of Luke ↗