their law the "chain" of causation. It is the worst chain that ever fettered a human being. You may use the language of liberty, if you like, about materialistic teaching, but it is obvious that this is just as inapplicable to it as a whole as the same language when applied to a man locked up in a mad-house. You may say, if you like, that the man is free to think himself a poached egg. But it is surely a more massive and important fact that if he is a poached egg he is not free to eat, drink, sleep, walk, or smoke a cigarette. Similarly you may say, if you like, that the bold determinist speculator is free to disbelieve in the reality of the will. But it is a much more massive and important fact that he is not free to praise, to curse, to thank, to justify, to urge, to punish, to resist temptations, to incite mobs, to make New Year resolutions, to pardon sinners, to rebuke tyrants, or even to say "thank you" for the mustard.

In passing from this subject I may note that there is a queer fallacy to the effect that materialistic fatalism is in some way favourable to mercy, to the abolition of cruel punishments or punishments of any kind. This is startlingly the reverse of the truth. It is quite tenable that the doctrine of necessity makes no difference at all; that it leaves the flogger flogging and the kind friend exhorting as before. But obviously if it stops either of them it stops the kind exhortation. That the sins are inevitable does not prevent punishment; if it prevents anything it prevents persuasion. Determinism is quite as likely to lead to cruelty as it is certain to lead to cowardice. Determinism is not inconsistent with the cruel treatment of criminals. What it is (perhaps) inconsistent with is the generous treatment of criminals; with any appeal to their better feelings or encouragement in their moral struggle. The determinist does not believe in appealing to the will, but he does believe in changing the environment. He must not say to the sinner, "Go and sin no more," because the sinner cannot help it. But he can put him in boiling oil; for boiling oil is an environment. Considered as a figure, therefore, the materialist has the fantastic outline of the figure of the madman. Both take up a position at once unanswerable and intolerable.

Of course it is not only of the materialist that all this is true. The same would apply to the other extreme of speculative logic. There is a sceptic far more terrible than he who believes that everything began in matter. It is possible to meet the sceptic who believes that everything began in himself. He doubts not the existence of angels or devils, but the existence of men and cows. For him his own friends are a mythology made up by himself. He created his own father and his own mother. This horrible fancy has in it something decidedly attractive to the somewhat mystical egoism of our day. That publisher who thought that men would get on if they believed in themselves, those seekers after the Superman who are always looking for him in the looking-glass, those writers who talk about impressing their personalities instead of creating life for the world, all these people have really only an inch between them and this awful emptiness. Then when this kindly world all round the man has been blackened out like a lie; when friends fade into ghosts, and the foundations of the world fail; then when the man, believing in nothing and in no man, is alone in his own nightmare, then the great individualistic motto shall be written over him in avenging irony. The stars will be only dots in the blackness of his own brain; his mother's face will be only a sketch from his own insane pencil on the walls of his cell. But over his cell shall be written, with dreadful truth, "He believes in himself."

All that concerns us here, however, is to note that this panegoistic extreme of thought exhibits the same paradox as the other extreme of materialism. It is equally complete in theory and equally crippling in practice. For the sake of simplicity, it is easier to state the notion by saying that a man can believe that he is always in a dream. Now, obviously there can be no positive proof given to him that he is not in a dream, for the simple reason that no proof can be offered that might not be offered in a dream. But if the man began to burn down London and say that his housekeeper would soon call him to breakfast, we should take him and put him with other logicians in a place which has often been alluded to in the course of this chapter. The man who cannot believe his senses, and the man who cannot believe anything else, are both insane, but their insanity is proved not by any error in their argument, but by the manifest mistake of their whole lives. They have both locked themselves up in two boxes, painted inside with the sun and stars; they are both unable to get out, the one into the health and happiness of heaven, the other even into the health and happiness of the earth. Their position is quite reasonable; nay, in a sense it is infinitely reasonable, just as a threepenny bit is infinitely circular. But there is such a thing as a mean infinity, a base and slavish eternity. It is amusing to notice that many of the moderns, whether sceptics or mystics, have taken as their sign a certain eastern symbol, which is the very symbol of this ultimate nullity. When they wish to represent eternity, they represent it by a serpent with his tail in his mouth. There is a startling sarcasm in the image of that very unsatisfactory meal. The eternity of the material fatalists, the eternity of the eastern pessimists, the eternity of the supercilious theosophists and higher scientists of to-day is, indeed, very well presented by a serpent eating his tail, a degraded animal who destroys even himself.

This chapter is purely practical and is concerned with what actually is the chief mark and element of insanity; we may say in summary that it is reason used without root, reason in the void. The man who begins to think without the proper first principles goes mad, the man who begins to think at the wrong end. And for the rest of these pages we have to try and discover what is the right end. But we may ask in conclusion, if this be what drives men mad, what is it that keeps them sane? By the end of this book I hope to give a definite, some will think a far too definite, answer. But for the moment it is possible in the same solely practical manner to give a general answer touching what in actual human history keeps men sane. Mysticism keeps men sane. As long as you have mystery you have health; when you destroy mystery you create morbidity. The ordinary man has always been sane because the ordinary man has always been a mystic. He has permitted the twilight. He has always had one foot in earth and the other in fairyland. He has always left himself free to doubt his gods; but (unlike the agnostic of to-day) free also to believe in them. He has always cared more for truth than for consistency. If he saw two truths that seemed to contradict each other, he would take the two truths and the contradiction along with them. His spiritual sight is stereoscopic, like his physical sight: he sees two different pictures at once and yet sees all the better for that. Thus he has always believed that there was such a thing as fate, but such a thing as free will also. Thus he believed that children were indeed the kingdom of heaven, but nevertheless ought to be obedient to the kingdom of earth. He admired youth because it was young and age because it was not. It is exactly this balance of apparent contradictions that has been the whole buoyancy of the healthy man. The whole secret of mysticism is this: that man can understand everything by the help of what he does not understand. The morbid logician seeks to make everything lucid, and succeeds in making everything mysterious. The mystic allows one thing to be mysterious, and everything else becomes lucid. The determinist makes the theory of causation quite clear, and then finds that he cannot say "if you please" to the housemaid. The Christian permits free will to remain a