Phillip Yancey, What's So Amazing About Grace, Zondervan, 1997, p. 71
By instinct I feel I must do something in order to be accepted. Grace sounds a startling note of contradiction, of liberation, and every day I must pray anew for the ability to hear its message. Eugene Peterson draw a contrast between Augustine and Pelagius, two fourth-century theological opponents. Pelagius was urbane, courteous, convincing, and liked by everyone. Augustine squandered away his youth in immorality, had a strange relationship with his mother, and made many enemies. Yet Augustine started from God's grace and got it right, whereas Pelagius started from human effort and got it wrong. Augustine passionately pursued God; Pelagius methodically worked to please God.
Peterson goes on to say that Christians tend to be Augustinian in theory but Pelagian in practice. They work obsessively to please other people and even God.