Luke 7:39

Now when the Pharisee which had bidden Him saw it, he spake within himself, saying, this man, if He were a prophet, would have known who and what manner of woman this is that toucheth Him: for she is a sinner, and therefore unfit to touch a holy prophet. This Pharisee was, as S. Augustine says (Serm. 23), one of those self-righteous men, of whom Isaiah wrote, chap. lii. II.

But Simon's reasoning was false, for the unclean touched Christ that they might be cleansed by Him. For this cause He came into the world, that as the good physician, He might heal all manner of diseases, whether of the body or of the soul. He was offended, therefore, because, as Euthymius says, he knew not that Christ, although very God, was made man to save sinners. And, again, the Magdalene was not now unclean, for she had been cleansed by contrition, as Christ proceeded to show. Simon was deceived, because he judged of the past, and not of the present. For Mary was the same, yet another. Another, yet her very self, says Chrysologus (Serm. 74).Wherefore the humble penitent was holier than the proud Pharisee, who, if he had not already sinned as deeply as the Magdalene, was liable from his spiritual pride to fall into as great a sin. S. Augustine (in loc. cit.). Hence in many things the Pharisee offended, as Toletus shows. Therefore, S. Gregory (Hom. 33), concludes thus: "We should in another's fall lament our own sin; for perhaps, under similar circumstances, we should in like manner offend, and although punishment should always follow on sin, we ought to make a distinction, to be harsh and severe in our treatment of vice, but to be compassionate to the weakness of human nature. For though the sinner must be punished, he must be gently dealt with, as our neighbour."