"If you don't believe you can do something then you can't."

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Personal power involves producing success through modeling what works and taking consistent action towards your goals. At the same time, you have to internalize behavioral and belief changes in order to take the necessary action to produce the results. It's been said that successful people do what others won't, and that if you believe you can or you believe you can't, you're right. Both of those statements are true.

— Tony Robbins