Your self-beliefs either ...

Your self-beliefs either support or undermine you.
Your self-beliefs either support or undermine you.
 Marisa Peer

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It really is all about believing in yourself: 80 per cent mental, 20 per cent physical.
 Victoria Pendleton
Courage - a perfect sensibility of the measure of danger, and a mental willingness to endure it.
 William Tecumseh Sherman
Regardless of how you feel inside, always try to look like a winner. Even if you are behind, a sustained look of control and confidence can give you a mental edge that results in victory.
 Diane Arbus
Courage is rightly esteemed the first of human qualities... because it is the quality which guarantees all others.
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.