If someone wronged you and apologizes, and you feel their sincerity is truly genuine, forgive them and move on. If someone falls on the other side of the street, hurry over and help. In each case, don’t do it because you believe it’s the right thing to do. Even though that’s a good belief to hold on to, you should do it because you want to.
If you don’t feel this way, train yourself to do so. You can do it! As with other things you train yourself to do, eventually it will become natural to you. The reward is you will have achieved one of the great qualities of your humanity: Compassion. Spiritual peace will then substantially increase in your life.