We've all heard that we have to learn from our mistakes, but I think it's more important to learn from successes. If you learn only from your mistakes, you are inclined to learn only errors.
Norman Vincent PealeAny fact facing us, however difficult, even seemingly hopeless, is not so important as our attitude toward that fact. How you think about a fact may defeat you before you ever do anything about it. You may permit a fact to overwhelm you mentally before you deal with it actually. On the other hand, a confident and optimistic thought pattern can overcome or modify the fact altogether.
Norman Vincent Peale