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Augustine started from God's grace and got it right, Pelagius started from human effort and got it wrong. Augustine passionately pursued God; Pelagius methodically worked to please God.

Philip Yancey (1997). “What's So Amazing about Grace?”, p.71, Harper Collins
Augustine started from God's grace and got it right, Pelagius started from human effort and got it wrong. Augustine passionately pursued God; Pelagius methodically worked to please God.