"Think success, don't think failure. At work, in your home, substitute success thinking for failure thinking. When you face a difficult situation, think, I'll win, not I'll probably lose. When you compete with someone else, think, I'm equal to the best, not I'm out-classed. When opportunity appears, think I can do it, never I can't. Let the master thought I-will-succeed dominate your thinking process. Thinking success conditions your mind to create plans that produce success. Thinking failure does the exact opposite. Failure thinking conditions the mind to think other thoughts that produce failure."
- David J. Schwartz