What fixes anger and resentments…love and prayers. Working to achieve piece of mind isn’t easy and it can take time because we are human. That is why we strive to achieve spiritual progress, not spiritual perfection, page 551.
Remove resentments and filling that void with love/patience/tolerance is not easy. Resentments build like a tidal wave and hit unexpectedly, that is why we spend so much time identifying and working thru them.
song ref: Digging up bones — Randy Travis