What a strange thing bitterness is! It breaks in on us when we need it least, when we’re down and in desperate need of all our freedom, ability, and energy to get back up. And what strange things bitterness can do to us. It slowly sets, like a permanent plaster cast, perhaps protecting the wearer from further pain but ultimately holding the sufferer rigid in frozen animation. Feelings and responses have turned to concrete. Bitterness is paralysis.
A young man, falsely accused, condemned and penalized by his high school principal, turns sullen, angry, bitter. His faith in all justice and authority dies. He will not forgive.
A girl, betrayed by a fellow she trusted, is forced, becomes pregnant, then turns bitter and withdrawn. Her faith in all humanity ends. She cannot forgive.
A woman, deserted by her husband, left to be both mother and father to their two sons, turns angry at life- at the whole universe. Her faith in God and everything good has ended. She did not forgive.
Bitterness is such a potent paralysis of mind, soul and spirit that it can freeze our reason, emotions and all our responses.
David Augsburger, The Freedom of Forgiveness