This powerful scene from Invictus (directed by Clint Eastwood [Warner Bros., 2009]) recounts the story of Nelson Mandela insisting that his leaders extend forgiveness to the very people who sinned against them and previously wanted them dead: https://www.youtube.com/watch?v=HHqi6ZB_F0U. In an even greater way, God extends mercy to us even though we continually reject him.