When Jesus heard it, he said unto them,
They that are whole have no need of the physician, but they that are sick: I came not to call the righteous, but sinners to repentance.
All Commentaries on Mark 2:17 Go To Mark 2
Augustine of Hippo
AD 430
Pray for us that we may be saved by that salvation of which it is said: “They that are in health need not a physician, but they that are ill; for I am not come to call the just but sinners.” Pray, then, for us that we may be made upright. This is indeed something which one cannot do unless he knows and wishes it; and he will become so as constantly as he wishes it fully—but it will not be through his own effort that he is able, unless he is healed and helped by the grace of the Spirit. Letter , To Anastasius.