"It's easy to forgive people who have never done anything to make us angry. People who do make us angry, however, are our most important teachers. They indicate the limits to our capacity for forgiveness. "Holding grievances is an attack on God's plan for salvation." The decision to let go our grievances against other people is the decision to see ourselves as we truly are, because any darkness we let blind us to another's perfection also blinds us to our own. It can be very hard to let go of your perception of someone's guilt when you know that by every standard of ethics, morality, or integrity, you're right to find fault with them. But the Course asks, "Do you prefer that you be right or happy?"