The un-happiest of mortals is that man who insists upon reliving the past, over and over in imagination - continually criticizing himself for past mistakes - continually condemning himself for past sins.
Maxwell MaltzVisualizing, creative mental picturing, is no more difficult than what you do when you remember some scene out of the past, or worry about the future. Acting out new action patterns is no more difficult than deciding, then following through on tying your shoes in a new and different manner each morning, instead of continuing to tie them in your old habitual way, without thought or decision.
Maxwell Maltz