Imagination does not breed insanity. Exactly what does breed insanity is reason. Poets do not go mad; but chess players do... 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... He was damned by John Calvin... 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... 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... The madman is not the man who has lost his reason. The madman is the man who has lost everything except his reason... Materialists and madmen never have doubts... Mysticism keeps men sane. As long as you have the mystery you have health; when you destroy mystery you create morbidity.

If Shakespeare be considered as a MAN born in a rude age and educated in the lowest manner, without any instruction either from the world or from books, he may be regarded as a prodigy; if represented as a POET capable of furnishing a proper entertainment to a refined or intelligent audience, we must abate much of this eulogy. In his compositions, we regret that many irregularities, and even absurdities, should so frequently disfigure the animated and passionated scenes intermixed with them; and, at the same time, we perhaps admire the more those beauties on account of their being surrounded by such deformities. A striking peculiarity of sentiment, adapted to a single character, he frequently hits, as it were, by inspiration; but a reasonable propriety of thought he cannot for any time uphold. Nervous and picturesque expressions as well as descriptions abound in him; but it is in vain we look either for purity or simplicity of diction. His total ignorance of all theatrical art and conduct, however material a defect, yet, as it affects the spectator rather than the reader, we can more easily excuse than that want of taste which often prevails in his productions, and which gives way only by intervals to the irradiations of genius. [....] And there may even remain a suspicion that we overrate, if possible, the greatness of his genius; in the same manner as bodies often appear more gigantic on account of their being disproportioned and misshapen.

Genius is one of the many forms of insanity.

There was never a great genius without a touch of madness.

madness, in a higher sense, is the beginning of all wisdom

If a man comes to the door of poetry untouched by the madness of the Muses, believing that technique alone will make him a good poet, he and his sane compositions never reach perfection, but are utterly eclipsed by the performances of the inspired madman.

Genius in general is poetic. Where genius has been active it has been poetically active. The truly moral person is a poet.

Shakespeare was not a genius. He was, without the distant shadow of a doubt, the most wonderful writer who ever breathed. But not a genius. No angels handed him his lines, no fairies proofread for him. Instead, he learnt techniques, he learnt tricks, and he learnt them well. Genius,

Passion often makes a madman of the cleverest man, and renders the greatest fools clever.

The real madness probably is not another thing that the wisdom itself that, tired of discovering the shames of the world, has taken the intelligent resolution to become mad

A poet makes himself a visionary through a long, boundless, and systematized disorganization of all the senses. All forms of love, of suffering, of madness; he searches himself, he exhausts within himself all poisons, and preserves their quintessences. Unspeakable torment, where he will need the greatest faith, a superhuman strength, where he becomes all men the great invalid, the great criminal, the great accursed — and the Supreme Scientist! For he attains the unknown! Because he has cultivated his soul, already rich, more than anyone! He attains the unknown, and if, demented, he finally loses the understanding of his visions, he will at least have seen them! So what if he is destroyed in his ecstatic flight through things unheard of, unnameable: other horrible workers will come; they will begin at the horizons where the first one has fallen!

If anyone comes to the gates of poetry and expects to become an adequate poet by acquiring expert knowledge of the subject without the Muses' madness, he will fail, and his self-controlled verses will be eclipsed by the poetry of men who have been driven out of their minds.

Between genius and madness there is often not the thickness of a hair.

Madness is the acme of intelligence.