Pelagius — on Rom 3:4 (PELAGIUS'S COMMENTARY ON ROMANS)

“"Every man" means the majority. Paul's opponents had quoted this text as if David had meant: "For this reason have I sinned, that thou might appear just in judging me." But the true meaning is that God promised to punish sinners without showing favoritism and that some thought his delay in doing so amounted to a lie. God prevails when he judges the deeds of those from whom no one thought vengeance would ever be exacted. Or it may also mean that God has shown that he is concerned about mankind … and that he has overthrown those who wrongly suggest that he is not interested in human affairs.”