No one ever won a chess game by betting on each move. Sometimes you have to move backward to get a step forward. If there exists no possibility of failure, then victory is meaningless.
Most people give up just when they're about to achieve success.
They quit on the one yard line. If you can't make a mistake, you can't make anything. Failure is delay, not defeat. It is a temporary detour, not a dead end. When defeat comes, accept it as a signal that your plans are not sound, rebuild those plans, and set sail once more toward your coveted goal.