In his book Quantum Warrior:The Future of the Mind, John Kehoe explains the effects of anger and forgiveness:
Let’s say we’re angry with someone and have cut off contact with them. We might feel justified in this anger. Anger, resentment, hate and bitterness are always fuelled by righteous indignation, by events, real and imaginary, that we chatter about in our mind. We let this anger vibrate within us and are weakened every time we think of this person. Perhaps our internal dialogue takes over and we have numerous fictitious encounters with this person, all unpleasant, and each of these encounters weakens us.
From an energy point of view, forgiving this person would make a lot of sense, even if we don’t want to. When we forgive someone, energy that has been trapped in the anger, hate or resentment is released and then can be used in other ways. Forgiving releases captured energy, strengthening us. The benefits of forgiveness always go to the one who is forgiving, not to the one forgiven. There is wisdom in living this way. When we drop pettiness we strengthen ourselves.
We gather and harvest moments of fun, joy and beauty because doing so makes us strong. It is wasteful and disrespectful to not enjoy and appreciate the simple, everyday pleasures of life. It means we are either unconscious, neurotic, captured by pettiness or lost in our mind. … When we enjoy ourselves and drink deeply from moments of fun, joy and beauty that happen daily, feeling gratitude for these simple pleasures, we feel better and have more energy and become conscious.