Mental pictures offer us an opportunity to practice new traits and attitudes, which otherwise we could not do. This is possible because again - your nervous system cannot tell the difference between an actual experience and one that is vividly imagined.
Maxwell MaltzThe 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 MaltzOne's capacity for friendship, which can be developed, is basic to one's capacity for happiness.
Maxwell Maltz