Fear and its companion pain are two of the most useful thing that (1) men and animals possess, if they are properly used. If fire did not hurt when it bum, children would play with it until their hands were burnt away. (2) Similarly, if pain existed but fear did not, a child would burn itself again and again, because fear would not warn it to keep away the fire (3) that had burnt it before. A really fearless soldier-and some do exist-is not a good soldier so he is soon killed, and a dead soldier is of no (4) use to his army. Fear and pain are therefore two guards with which (5) men and animals might soon die out. In our first sentence we suggested that fear ought to be properly used. If, for example, you never go out of your house because the danger of being knocked down and killed in (6) the street by a car, you are letting fear rule you too much. Even in your house you are not absolute safe: an airplane may crash on your house, (7) or ants may eat away some of the beams in your roof so that the later falls (8) on you, or you may get cancer! The important thing is not let fear rule (9) you, but instead to use fear as your servant and guide. Fear will warn you of dangers; then you have to decide what action to make. (10)