Nature is a great believer in “double engines.” Man is equipped with nearly every organ in duplicate—eyes, ears, lungs, arms and legs, so that if one be weakened, its mate, through Reserve Power, is stimulated to do enough for both. Even where the organ itself is not duplicated, as in the nose, there is a division of parts so there is constant reserve. Nature, for still further protection, has for every part of the body an understudy in training, to be ready in a crisis,—as the sense of touch for the blind. Birds when frightened ruffle their feathers; a dog that has been in the water shakes its coat so that each hair stands out of itself; the startled hedgehog projects every quill. These actions are produced by “skin muscles” that are rudimentary in man, and over which in ordinary conditions he has no control. But in a moment of terrible fear Reserve Power quickens their action in a second, and the hair on his head “stands on end” in the intensity of his fright. Nature, that thus watches so tenderly over the physical needs of man, is equally provident in storing for him a mental and a moral Reserve Power. Man may fail in a dozen different lines of activity and then succeed brilliantly in a phase wherein he was unconscious of any ability. We must never rest content with what we _are_, and say: “There is no use for me to try. I can never be great. I am not even clever now.” But the law of Reserve Power stands by us as a fairy godmother and says: “There is one charm by which you can transmute the dull dross of your present condition into the pure gold of strength and power,—that charm is ever doing your best, ever daring more, and the full measure of your final attainment can never be told in advance. Rely upon me to help you with new revelations of strength in new emergencies. Never be cast down because your power seems so trifling, your progress so slow. The world’s greatest and best men were failures in some line, failures many times before failure was crowned with success.” There is in the mythology of the Norsemen a belief that the strength of an enemy we kill enters into us. This is true in character. As we conquer a passion, a thought, a feeling, a desire; as we rise superior to some impulse, the strength of that victory, trifling though it may be, is stored by Nature as a Reserve Power to come to us in the hour of our need.