Some people think that one big home run will set them on easy street for life. They think that when they accomplish something, the game is essentially finished, and they can move on to something else. But the world doesn’t really work that way. Very often, the reward of labor is more labor: but the new work is different in character from the old. The creative labor of invention is replaced by the fighting labor of preservation. We can see an example of this principle in the career of Alexander Graham Bell, the inventor of the telephone.