Keep on Trying Until You Succeed

If you set yourself a goal and begin working toward it, come what may, you must not give up just because you suffer a setback. If you are faint-hearted enough to let one or two failures put you off, you will never really accomplish anything.
The world is in a constant state of change and flux. Even if you fail once, do not lose heart: as you keep on trying, patiently and steadily, the situation may change to your advantage, and new doors may open to you. Many so-called failures are the result of giving up too early.

Source : "Velvet Glove Iron Fist"