The animal is more responsive to nature than man, and nature helps the animal to forget its illness more than it does man, because man is not responsive to nature. Every man has his little world; it may be so little sometimes that it is like a doll's house; and in that world he lives. He is not conscious of the wide world, he is not conscious of the universe; he just lives in his small world; that is all he knows, that is all he is conscious of, that is all he is interested in. And, therefore, if his world is full of misery and illness and ill-luck, he cannot get out of it, because he has made a kind of shell, as creatures in the water make a shell to live in. The world does not hold misery for him; he has made the shell of misery for himself and he likes to hide in that shell. Because he has made it he likes to live in it, it is his home, be it a shell of wickedness, of misery, of goodness, of piety, or anything else.