The madman is not he that defies the world. The saint, the criminal, the martyr, the cynic, the nihilist may all defy the world quite sanely. And even if such fanatics would destroy the world, the world owes them a strictly fair trial according to proof and public law. But the madman is not the man who defies the world; he is the man who denies it. Suppose we are all standing round a field and looking at a tree in the middle of it. It is perfectly true that we all see it (as the decadents say) in infinitely different aspects: that is not the point; the point is that we all say it is a tree. Suppose, if you will, that we are all poets, which seems improbable; so that each of us could turn his aspect into a vivid image distinct from a tree. Suppose one says it looks like a green cloud and another like a green fountain, and a third like a green dragon and the fourth like a green cheese. The fact remains: that they all say it looks like these things. It is a tree. Nor are any of the poets in the least mad because of any opinions they may form, however frenzied, about the functions or future of the tree. A conservative poet may wish to clip the tree; a revolutionary poet may wish to burn it. An optimist poet may want to make it a Christmas tree and hang candles on it. A pessimist poet may want to hang himself on it. None of these are mad, because they are all talking about the same thing. But there is another man who is talking horribly about something else. There is a monstrous exception to mankind. Why he is so we know not; a new theory says it is heredity; an older theory says it is devils. But in any case, the spirit of it is the spirit that denies, the spirit that really denies realities. This is the man who looks at the tree and does not say it looks like a lion, but says that it is a lamp–post.

I do not mean that all mad delusions are as concrete as this, though some are more concrete. Believing your own body is glass is a more daring denial of reality than believing a tree is a glass lamp at the top of a pole. But all true delusions have in them this unalterable assertion—that what is not is. The difference between us and the maniac is not about how things look or how things ought to look, but about what they self–evidently are. The lunatic does not say that he ought to be King; Perkin Warbeck might say that. He says he is King. The lunatic does not say he is as wise as Shakespeare; Bernard Shaw might say that. The lunatic says he is Shakespeare. The lunatic does not say he is divine in the same sense as Christ; Mr. R.J. Campbell would say that. The lunatic says he is Christ. In all cases the difference is a difference about what is there; not a difference touching what should be done about it.
 
For this reason, and for this alone, the lunatic is outside public law. This is the abysmal difference between him and the criminal. The criminal admits the facts, and therefore permits us to appeal to the facts. We can so arrange the facts around him that he may really understand that agreement is in his own interests. We can say to him, “Do not steal apples from this tree, or we will hang you on that tree.” But if the man really thinks one tree is a lamp–post and the other tree a Trafalgar Square fountain, we simply cannot treat with him at all. It is obviously useless to say, “Do not steal apples from this lamp–post, or I will hang you on that fountain.” If a man denies the facts, there is no answer but to lock him up. He cannot speak our language: not that varying verbal language which often misses fire even with us, but that enormous alphabet of sun and moon and green grass and blue sky in which alone we meet, and by which alone we can signal to each other. That unique man of genius, George Macdonald, described in one of his weird stories two systems of space co–incident; so that where I knew there was a piano standing in a drawing–room you knew there was a rose–bush growing in a garden. Something of this sort is in small or great affairs the matter with the madman. He cannot have a vote, because he is the citizen of another country. He is a foreigner. Nay, he is an invader and an enemy; for the city he lives in has been super–imposed on ours.
 
Now these two things are primarily to be noted in his case. First, that we can only condemn him to a general doom, because we only know his general nature. All criminals, who do particular things for particular reasons (things and reasons which, however criminal, are always comprehensible), have been more and more tried for such separate actions under separate and suitable laws ever since Europe began to become a civilisation—and until the rare and recent re–incursions of barbarism in such things as the Indeterminate Sentence. Of that I shall speak later; it is enough for this argument to point out the plain facts. It is the plain fact that every savage, every sultan, every outlawed baron, every brigand–chief has always used this instrument of the Indeterminate Sentence, which has been recently offered us as something highly scientific and humane. All these people, in short, being barbarians, have always kept their captives captive until they (the barbarians) chose to think the captives were in a fit frame of mind to come out. It is also the plain fact that all that has been called civilisation or progress, justice or liberty, for nearly three thousand years, has had the general direction of treating even the captive as a free man, in so far as some clear case of some defined crime had to be shown against him. All law has meant allowing the criminal, within some limits or other, to argue with the law: as Job was allowed, or rather challenged, to argue with God. But the criminal is, among civilised men, tried by one law for one crime for a perfectly simple reason: that the motive of the crime, like the meaning of the law, is conceivable to the common intelligence. A man is punished specially as a burglar, and not generally as a bad man, because a man may be a burglar and in many other respects not be a bad man. The act of burglary is punishable because it is intelligible. But when acts are unintelligible, we can only refer them to a general untrustworthiness, and guard against them by a general restraint. If a man breaks into a house to get a piece of bread, we can appeal to his reason in various ways. We can hang him for housebreaking; or again (as has occurred to some daring thinkers) we can give him a piece of bread. But if he breaks in, let us say, to steal the parings of other people’s finger nails, then we are in a difficulty: we cannot imagine what he is going to do with them, and therefore cannot easily imagine what we are going to do with him. If a villain comes in, in cloak and mask, and puts a little arsenic in the soup, we can collar him and say to him distinctly, “You are guilty of Murder; and I will now consult the code of tribal law, under which we live, to see if this practice is not forbidden.” But if a man in the same cloak and mask is found at midnight putting a little soda–water in the soup, what can we say? Our charge necessarily becomes a more general one. We can only observe, with a moderation almost amounting to weakness, “You seem to be the sort of person who will do this sort of thing.” And then we can lock him up. The principle of the indeterminate sentence is the creation of the indeterminate mind. It does apply to the incomprehensible creature, the lunatic. And it applies to nobody else.

The second thing to be noted is this: that it is only by the unanimity of sane men that we can condemn this man as utterly separate. If he says a tree is a lamp–post he is mad; but only because all other men say it is a tree. If some men thought it was a tree with a lamp on it, and others thought it was a lamp–post wreathed with branches and vegetation, then it would be a matter of opinion and degree; and he would not be mad, but merely extreme. Certainly he would not be mad if nobody but a botanist could see it was a tree. Certainly his enemies might be madder than he, if nobody but a lamplighter could see it was not a lamp–post. And similarly a man is not imbecile if only a Eugenist thinks so. The question then raised would not be his sanity, but the sanity of one botanist or one lamplighter or one Eugenist. That which can condemn the abnormally foolish is not the abnormally clever, which is obviously a matter in dispute. That which can condemn the abnormally foolish is the normally foolish. It is when he begins to say and do things that even stupid people do not say or do, that we have a right to treat him as the exception and not the rule. It is only because we none of us profess to be anything more than man that we have authority to treat him as something less.