Bitterness is the outcome of a wrong mental movement - the attempt to force external events to conform to internal fantasy. The cure is to see fantasy as fantasy, which will reveal it as neither necessary nor rewarding.
Vernon HowardA chief cause of unhappiness is what I call mental movies. Mental movies are a misuse of the imagination. You know how it goes. You have a painful experience with someone, then run it over and over in your mind. You visualize what you said, what he did, how you both felt. As awful as it is, you feel compelled to repeat the film day and night. It is as if you were locked inside a theatre playing a horrible movie.
Vernon Howard