You can now filter out all that noise and confusion about habits and human behavior. Because you know how behavior works, you what to pay attention to and embrace, and what to ignore and discard. If an e-mail from a friend comes through about a new exercise or diet program, a quick scan will tell you all you need to know. Will it help you do what you already want to do? Will it help you feel successful? The answers to those questions are freeing because if the change program doesn’t satisfy these two requirements, it’s not worth your time.