Desire plays the same role with man at his higher stage of evolution. It stimulates him to action; and always as his activity satisfies his original desire a new one replaces the old and lures him on to renewed exertion. The average young man beginning his business career, desires only a comfortable cottage. But when that is attained he wants a mansion. He soon tires of the mansion and wants a palace. Then he wants several--at the seaside, in the city, and on the mountains. At first he is satisfied with a horse; then he demands an automobile, and finally a steam yacht. He sets out as a youth to earn a livelihood and welcomes a small salary. But the desire for money pushes him into business for himself and he works tirelessly for a competence. He feels that a small fortune should satisfy anybody but when he gets it he wants to be a millionaire. If he succeeds in that he then desires to become a multi-millionaire. Whether the desire is for wealth, or for fame, or for power, the same result follows--when the desire is satisfied a greater one takes its place and spurs the ambitious one to still further exertion. He grasps the prize he believes to contain complete satisfaction only to discover that while he was pursuing it desire had grown beyond it, and so the goal he would attain is always far ahead of him. Thus are we tricked and apparently mocked by nature until we finally awake to the fact that all the objects of desire--the fine raiment, the jewels, the palaces, the wealth, the power, are but vain and empty things; and that the real reward for all our efforts to secure them is not these objects at all _but the new powers we have evolved in getting them;_ powers that we did not before possess and which we should not have evolved but for nature's great propulsive force--desire. The man who accumulates a fortune by many years of persistent effort in organizing and developing a business enterprise, by careful planning and deep thinking, may naturally enough look upon the fortune he will possess for a few years before it passes on to others, as his reward. But the truth is that it is a very transient and perishable and worthless thing compared to the new powers that were unconsciously evolved in getting it--powers that will be retained by the man and be brought into use in future incarnations. Desire, then, plays a most important role in human evolution. It awakens, stimulates, propels. What wind is to the ship, what steam is to the locomotive, desire is to the human being.