_Four walls_.--Arm-chair philosophy is being condemned--rightly. An arm-chair thinker is busy deciding on everything that is taking place in the world: the state of the world market, the existence of a world-soul, wireless telegraphy and the life after death, the cave dweller and the perfectibility of man, and so on and so on. His chief business is so to select his statements that there shall be no internal contradiction; and this will give an appearance of truth. Such work, which is quite amusing and even interesting, leads at last to very poor results. Surely verisimilitudes of truth are not truth: nor have necessarily anything in common with truth. Again, a man who undertakes to talk of everything probably knows nothing. Thus a swan can fly, and walk, and swim. But it flies indifferently, walks badly, and swims poorly. An arm-chair philosopher, enclosed by four walls, sees nothing but those four walls, and yet of these precisely he does not choose to speak. If by accident he suddenly realised them and spoke of them his philosophy might acquire an enormous value. This may happen when a study is converted into a prison: the same four walls, but impossible not to think of them! Whatever the prisoner turns his mind to--Homer, the Greek-Persian wars, the future world-peace, the bygone geological cataclysms--still the four walls enclose it all. The calm of the study supplanted by the pathos of imprisonment. The prisoner has no more contact with the world, and no less. But now he no longer slumbers and has grayish dreams called world-conceptions. He is wide awake and strenuously living. His philosophy is worth hearing. But man is not distinguished for his powers of discrimination. He sees solitude and four walls, and says: a study. He dreams of the market-place, where there is noise and jostling, physical bustle, and decides that there alone life is to be met. He is wrong as usual. In the market-place, among the crowd, do not men sleep their deadest sleep? And is not the keenest spiritual activity taking place in seclusion? 14