Holding on to anger resentment and hurt only gives you tense muscles a headache and a sore jaw from clenching your teeth. Forgiveness gives you back the laughter and the lightness in your life.
In times of great stress or adversity it's always best to keep busy to plow your anger and your energy into something positive.
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I know to banish anger altogether from one's breast is a difficult task. It cannot be achieved through pure personal effort. It can be done only by God's grace.