Learn to fail privately, quickly and cheaply? ;) Less flippantly, if you don't do something because you think you won't succeed, then there's no chance of you

Learn to fail privately, quickly and cheaply? ;) Less flippantly, if you don't do something because you think you won't succeed, then there's no chance of you succeeding. If you try something, don't succeed, learn from the experience and try again, there's a chance that you may succeed.