Matthew 19:20

Those words, what lack I yet? are not in Mark or Luke. The young man understood these commandments according to the Pharisees interpretation of them, who, as we heard, Matthew 5:1, interpreted them only as prohibiting the overt acts, not the inward lusts and motions of the heart, together with the means or occasions leading to such acts. Paul saith, he had not known lust, except the law had said, Thou shalt not covet, Romans 7:7. Men that deceive themselves with false glosses and interpretations may think they keep the commandments of God, and be very confident of a righteousness in themselves; but it is impossible others should be so. What lack I yet? He expected Christ should have set him some new task, and was not aware that he only wanted a better knowledge and understanding of the law to convince him of his mistake.