"Of all my accomplishments I may have achieved during the war, I am proudest of the fact that I never lost a wingman."

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But countless studies have shown that a cue and a reward, on their own, aren't enough for a new habit to last. Only when your brain starts expecting the reward--craving the endorphins or sense of accomplishment--will it become automatic to lace up your jogging shoes each morning. The cue, in addition to triggering a routine, must also trigger a craving for the reward to come.

— Charles Duhigg