You need not worry or make yourself sleepless about the world. It will go on without you. When you have avoided fanaticism, then alone will you work well. It is the levelheaded and calm person, of good judgment and cool nerves, of great sympathy and love, who does good work and so does good to himself. The fanatic is foolish and has no sympathy; he can never straighten the world, nor himself become pure and perfect.