17 Our Lord then told him the parable of the two debtors; and made him judge; that by his tongue He might catch him in whose heart the truth was not. One owed five hundred dinars. Here then our Lord showed to the Pharisee the multitude of the offenses of the sinful woman. He then who imagined concerning our Lord that He did not know that she was a sinner, in the result heard from Him how great was the debt of her sins. The Pharisee, then, who imagined that our Lord did not know who she was, and what was the reputation of the sinful woman, was found himself not to know who our Lord was, and what was His reputation.
Thus he was reproved in his error, who did not even perceive his error. For the knowledge that he was assuredly erring eluded him in his error. But he received a reminder from Him Who came to remind them that err. The Pharisee had seen great signs done by our Lord, as Israel by Moses; but because there was not faith in him, that those prodigies which he saw might be conjoined with that faith, a little cause hindered and annulled them. Had this man been a prophet, he would have known that this woman is a sinner.
For he let slip the wonders that he had seen, and blindness readily entered into him. For he was of the sons of Israel, whom terrible signs accompanied up to the sea, that they might fear; and blessed miracles surrounded in the waste desert, that they might be reconciled; but through lack of faith, for a slight cause, they rejected them [saying]; As for this Moses who brought us up, we know not what has become of him. For they ceased to regard the mighty works that had been surrounding them.
They perceived that Moses was not near them; so that for this cause that had come near, they drew [near] to the heathenism of Egypt. For Moses was for a little removed from before them, that the calf that was before them might appear, that they might worship it openly also; for they had been secretly worshipping it in their hearts.
Source: On Our Lord (New Advent)