“Resentment often builds up when you fail to communicate effectively with the people you resent. That is, when you didn’t tell them you felt hurt, or didn’t communicate your needs and wants, assuming they would naturally cater to them. It can also grow when you did express your feelings but can’t let go of them and forgive. As Nelson Mandela once said, “Resentment is like drinking poison and then hoping it will kill your enemies.” It just doesn’t work.”