The most difficult positive mood for me. I had no idea what it was for most of my life. I thought it was acknowledging past injuries. This is not acceptance. Pema Chodron speaks to this move, from resentment to acceptance. It is much more than forgiveness as well. Good luck with this one. Transformative.
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This morning while reading Edward Packard pdf 
from Nine Things I Learned I realized that moving from resentment to acceptance removes all the emotion from resentment. None of the facts are denied. All the emotion is dropped. So one still hates without emotion.