From G.K. Chesterton’s Orthodoxy:
It is true that some speak lightly and loosely of insanity as in itself attractive. But a moment’s thought will show that if disease is beautiful, it is generally someone else’s disease. A blind man may be picturesque; but it requires two eyes to see the picture. And similarly even the wildest poetry of insanity can only be enjoyed by the sane. To the insane man his insanity is quite prosaic, because it is quite true. A man who thinks himself a chicken is to himself as ordinary as a chicken. A man who thinks he is a bit of glass is to himself as dull as a bit of glass. It is the homogeneity of his mind which makes him dull, and which makes him mad. It is only because we see the irony of his idea that we think him even amusing; it is only because he does not see the irony of his idea that he is put in an asylum at all. In short, oddities only strike ordinary people. Oddities do not strike odd people. This is why ordinary people have a much more exciting time; while odd people are always complaining of the dulness of life. This is also why the new novels die so quickly, and why the old fairy tales endure for ever. The old fairy tale makes the hero a normal human boy; it is his adventures that are startling; they startle him because he is normal. But in the modern psychological novel the hero is abnormal; the centre is not central. Hence the fiercest adventures fail to affect him adequately, and the book is monotonous. You can make a story out of a hero among dragons; but not out of a dragon among dragons. The fairy tale discusses what a sane man will do in a mad world. The sober realistic novel of to-day discusses what an essential lunatic will do in a dull world.
Let us begin, then, with the mad-house; from this evil and fantastic inn let us set forth on our intellectual journey. Now, if we are to glance at the philosophy of sanity, the first thing to do in the matter is to blot out one big and common mistake. There is a notion adrift everywhere that imagination, especially mystical imagination, is dangerous to man’s mental balance. Poets are commonly spoken of as psychologically unreliable; and generally there is a vague association between wreathing laurels in your hair and sticking straws in it. Facts and history utterly contradict this view. Most of the very great poets have been not only sane, but extremely business-like; and if Shakespeare ever really held horses, it was because he was much the safest man to hold them. Imagination does not breed insanity. Exactly what does breed insanity is reason. Poets do not go mad; but chess-players do. Mathematicians go mad, and cashiers; but creative artists very seldom. I am not, as will be seen, in any sense attacking logic: I only say that this danger does lie in logic, not in imagination. Artistic paternity is as wholesome as physical paternity. Moreover, it is worthy of remark that when a poet really was morbid it was commonly because he had some weak spot of rationality on his brain. Poe, for instance, really was morbid; not because he was poetical, but because he was specially analytical. Even chess was too poetical for him; he disliked chess because it was full of knights and castles, like a poem. He avowedly preferred the black discs of draughts, because they were more like the mere black dots on a diagram. Perhaps the strongest case of all is this: that only one great English poet went mad, Cowper. And he was definitely driven mad by logic, by the ugly and alien logic of predestination. Poetry was not the disease, but the medicine; poetry partly kept him in health. He could sometimes forget the red and thirsty hell to which his hideous necessitarianism dragged him among the wide waters and the white flat lilies of the Ouse. He was damned by John Calvin; he was almost saved by John Gilpin. Everywhere we see that men do not go mad by dreaming. Critics are much madder than poets. Homer is complete and calm enough; it is his critics who tear him into extravagant tatters. Shakespeare is quite himself; it is only some of his critics who have discovered that he was somebody else. And though St. John the Evangelist saw many strange monsters in his vision, he saw no creature so wild as one of his own commentators. The general fact is simple. Poetry is sane because it floats easily in an infinite sea; reason seeks to cross the infinite sea, and so make it finite. The result is mental exhaustion, like the physical exhaustion of Mr. Holbein. To accept everything is an exercise, to understand everything a strain. The poet only desires exaltation and expansion, a world to stretch himself in. The poet only asks to get his head into the heavens. It is the logician who seeks to get the heavens into his head. And it is his head that splits.