Luke 15:2

(in Hom. 34. in Evang.) But, on the contrary, they who from false justice are wont to pride themselves, despise all others, and never in mercy condescend to the weak; and thinking themselves not to be sinners, are so much the worse sinners. Of such were the Pharisees, who condemning our Lord because He received sinners, with parched hearts reviled the very fountain of mercy. But because they were so sick that they knew not of their sickness, to the end that they might know what they were, the heavenly Physician answers them with mild applications.

For this was His wont, for the sake whereof He had taken upon Him the flesh, to receive sinners as the physician those that are sick. But the Pharisees, the really guilty, returned murmurs for this act of mercy, as it follows, And the Pharisees and Scribes murmured, saying, &c.

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.