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Resentment or grudges do no harm to the person against whom you hold these feelings but every day and every night of your life, they are eating at you.

Dr. Norman Vincent Peale (2003). “The Power of Positive Thinking: 10 Traits for Maximum Results”, p.177, Simon and Schuster
Resentment or grudges do no harm to the person against whom you hold these feelings but every day and every night of your life, they are eating at you.