It is an awful fact, whether we like to allow it or not, that pride is one of the commonest sins which beset human nature. We are all born Pharisees.
We all naturally think far better of ourselves than we ought. We all naturally fancy that we deserve something better than we have. It is an old sin. It began in the garden of Eden, when Adam and Eve thought they had not got everything that their merits deserved.
It is a subtle sin. It rules and reigns in many a heart without being detected, and can even wear the garb of humility.
It is a most soul-ruining sin. It prevents repentance, keeps men back from Christ, checks brotherly love, and nips in the bud spiritual anxiety. Let us watch against it, and be on our guard. Of all garments, none is so graceful, none wears so well, and none is so rare, as true humility.
J.C. Ryle, Expository Thoughts on Mark, p.186
(HT: Erik Raymond)