Charles Duhigg said this quote

Grit, which they defined as the tendency to work strenuously toward challenges, maintaining effort and interest over years despite failure, adversity, and plateaus in progress.

~ Charles Duhigg

If you believe you can change—if you make it a habit—the change becomes real. This is the real power of habit: the insight that your habits are what you choose them to be. Once that choice occurs—and becomes automatic—it’s not only real, it starts to seem inevitable.

~ Charles Duhigg

The same process that makes AA so effective—the power of a group to teach individuals how to believe—happens whenever people come together to help one another change. Belief is easier when it occurs within a community.

~ Charles Duhigg

Reform is usually possible only once a sense of crisis takes hold.... In fact, crises are such valuable opportunities that a wise leader often prolongs a sense of emergency on purpose.

~ Charles Duhigg