Sometimes you have to move backward to get a step forward. Failure is delay, not defeat. It is a temporary detour, not a dead end. Our greatest glory is not in never falling, but in rising every time we fall. 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. 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. They finally won by their defeats. A man is not finished when he's defeated.