A promise is something we need to keep. If we promise something to someone, that someone relies on our word and trusts us. He believes that what we promised will happen. If we do not keep our word, we lose trust in that person, and sometimes further relationships are permanently damaged. A promise carries within it the positive energy of the realization of an act. If this does not happen to the person who expects the fulfillment of the promise, there is sadness, grief, confusion, resentment, which are actually all negative emotions full of negative energy.