The same process that makes AA so effectiveโthe power of a group to teach individuals how to believeโhappens whenever people come together to help one another change. Belief is easier when it occurs within a community.
Charles DuhiggHowever, to modify a habit, you must decide to change it. You must consiously accept the hard work of identifying the cues and rewards that drive the habits' routines, and find alternatives. You must know you have control and be self-conscious enough to use it -- and every chapter in this book is devoted to illustrating a different aspect of why that control is real.
Charles Duhigg