In the same way, we need to take care of ourselves. We need to forgive one another, so that we can be at peace with ourselves and with God. If we don't, we hurt ourselves more than anyone else.
I remember a story of a little girl who had a fight with her sister. As the day passed, she refused to speak to her sister. At bedtime, their mother said, "Don't you think you should forgive your sister before you go to sleep? The Bible says we should not let "the sun go down on our anger." The little girl thought for a moment and replied, "But how can I keep the sun from going down?"
There are many people that like to nurture resentment. I have found, in my own life, that holding on to resentment hurts me a lot more than it hurts anyone else. How about you?