Newton's All-Pervasive Humility and Gratitude at Having Been Saved
The effect of this amazement is tenderness toward others. "[The 'wretch' who has been saved by grace] believes and feels his own weakness and unworthiness, and lives upon the grace and pardoning love of his Lord. This gives him an habitual tenderness and gentleness Spirit. Humble under a sense of much forgiveness to himself, he finds it easy to forgive others."
Newton's Peaceful Confidence in the Pervasive, Loving Providence of God
(The fifth and final excerpt from a lecture for pastors by John Piper; the full text and audio can be found here.)