TFTD

Belief is nothing but a state, an internal representation that governs behavior. It can be an empowering belief in possibility -- a belief that we will succeed in something or achieve something else. It can be a disempowering belief -- a belief that we can't succeed, that our limitations are clear, intractable, and overwhelming. If you believe in success, you'll be empowered to achieve it. If you believe in failure, those messages will lead you to experience that as well." 

Anthony Robbins