"We all understand the value of sacrifice, even if that only involves setting aside dessert so as to lose weight, or putting money in the bank so as to later buy a house. Progress or achievement in any arena requires choices that often oppose what one feels like doing. The trick in truly succeeding with this in the long run is locating enough depth of feeling that the experience of conflicting desires dissolves. For that to happen, one has to learn how to think emotionally and physiologically."