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Good health is the most valuable thing in the world. When you’ve got it, you never think about it. When you haven’t got it, you think about it all the time. Our biggest enemies are not terrible diseases and so on. We are our own big gest enemies because we some times destroy our own good health. Some of us eat too much, drink too much and smoke too much. And though our reason tells us we should control ourselves, we find it difficult. The fact is that most human beings need stimulation (刺激). Who doesn’t enjoy a drink after a busy day? Only a smoker knows the pleasure of a cigarette with a cup of c offee.
