For a habit to stay changed, people must believe change is possible.

Belief is easier when it occurs within a community.

If you tell people that they have what it takes to succeed, they'll prove you right

When people have a willpower failure, it's because they haven't anticipated a situation that's going to come along.

As people strengthened their willpower muscles in one part of their lives—in the gym, or a money management program—that strength spilled over into what they ate or how hard they worked. Once willpower became stronger, it touched everything.

The biggest moment of flexibility in our shopping habits is when we have a child, because when you think about it, all of your old routines sort of go out the window, and suddenly a marketer can come in and sell you new kinds of things.

America is the Saudi Arabia of coal.