When we have resentment, and I'm not talking about the word resentment the way many philosophers do which is what resentment of the short run is a sign of self-respect. You can't do that to me. I won't stand for that. But then you move on from that.
So the short term moral righteous indignation can be called resentment, but psychologists when they use the word resentment they mean deep unhealthy anger that abides over a long period of time. And when you have that kind of resentment it's almost impossible to just leave that as a void and walk away from it. Because you know resentment is not a very friendly neighbor. Once it's inside of us it's hard to ask it to leave. I have known people who have held onto resentment for 40, 50, 60 years and they would be close to dying with it if they didn't practice forgiveness. The only thing I know of on this planet that can actually get rid of resentment when we're talking this deep kind that psychologists talk about is forgiveness. I think it's the only medicine that can cure us from a resentment that could kill us.