At some point, if you're changing a really deep-seated behavior, you're going to have a moment of weakness.
Charles DuhiggBut 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 DuhiggMaking your bed every morning is correlated with better productivity, a greater sense of well-being, and stronger skills at sticking with a budget.
Charles Duhigg