The true cure for self-righteousness is self-knowledge. Once let the eyes of our understanding be opened by the Spirit, and we shall talk no more of our own goodness. Once let us see what there is in our own hearts, and what the holy God requires, and self-conceit will die. We shall lay our hand on our mouths, and cry with the leper, ‘Unclean, unclean’ (Lev 13:45).
- JC Ryle, on Luke 18:9-14