Belief

From the book The Best of Success, compiled by Wynn Davis:

Belief - Belief is the knowledge that we can do something. It's the inner feeling that what we undertake, we can accomplish. For the most part, all of us have the ability to look at something and know whether or not we can do it. So, in belief there is power: our eyes are opened; our opportunities become plain; our visions become realities.

"The only thing that stands between a man and what he wants from life is often merely the will to try it and the faith to believe that it is possible."
   - Richard M. Devos

"Whether you think you can or think you can't - you are right."
   - Henry Ford

"The mind is the limit. As long as the mind can envision the fact that you can do something, you can do it - as long as you really believe 100 percent."
   - Arnold Schwarzenegger