Ambrose of Milan
Catena Aurea · Lukasevangelium 5
And after these things he went forth, and saw a Publican, named Levi, sitting at the receipt of custom: and he said unto him, Follow me. And he left all, rose up, and followed him. And Levi made him a great feast in his own house: and there was a great company of Publicans and of others that sat down with them. But their Scribes and Pharisees murmured against his disciples, saying, Why do ye eat and drink with Publicans and sinners? And Jesus answering said unto them, They that are whole need not a physician; but they that are sick. I came not to call the righteous, but sinners to repentance.
But how does God love righteousness, and David has never seen the righteous man forsaken, if the righteous are excluded, the sinner called; unless you understand that He meant by the righteous those who boast of the law, (Ps. 11:7, Ps. 37:25.) and seek not the grace of the Gospel. Now no one is justified by the law, but redeemed by grace. He therefore calls not those who call themselves righteous, for the claimers to righteousness are not called to grace. For if grace is from repentance, surely he who despises repentance renounces grace.