When you know the nature of any power, the results of its use are never mysterious to you. Yet miracles are wrought! And there are mysteries! It is always the unknown powers which are mysterious to you; it is such powers work what you call miracles! Yet a miracle is naught but the inevitable result of the ordinary operation of some power, which is unknown to you at the time the miracle is wrought. So long as the power is unknown to you, its operation is mysterious, and you call the result a miracle. But as soon as you know its nature, you no longer call the result a miracle, because the power that produces it is no longer mysterious.