"Negative capability" is the capacity of artists to pursue ideals of beauty, perfection and sublimity even when it leads them into intellectual confusion and uncertainty, as opposed to a preference for philosophical certainty over artistic beauty. The term, first used by John Keats in 1817, has been subsequently used by poets, philosophers and literary theorists to describe the ability to perceive and recognize truths beyond the reach of what Keats called "consecutive reasoning".
Keats used the phrase only briefly in a private letter to his brothers George and Thomas on 22 December 1817, and it became known only after his correspondence was collected and published. Keats described a conversation he had been engaged in a few days previously:
I had not a dispute but a disquisition with Dilke, upon various subjects; several things dove-tailed in my mind, and at once it struck me what quality went to form a Man of Achievement, especially in Literature, and which Shakespeare possessed so enormously—I mean Negative Capability, that is, when a man is capable of being in uncertainties, mysteries, doubts, without any irritable reaching after fact and reason—Coleridge, for instance, would let go by a fine isolated verisimilitude caught from the Penetralium of mystery, from being incapable of remaining content with half-knowledge. This pursued through volumes would perhaps take us no further than this, that with a great poet the sense of Beauty overcomes every other consideration, or rather obliterates all consideration.
Samuel Taylor Coleridge was, by 1817, a frequent target of criticism by the younger poets of Keats's generation, often ridiculed for his infatuation with German idealistic philosophy. Against Coleridge's obsession with philosophical truth, Keats sets up the model of Shakespeare, whose poetry articulated various points of view and never advocated a particular vision of truth.
Keats' ideas here, as was usually the case in his letters, were expressed tersely with no effort to fully expound what he meant, but passages from other letters enlarge on the same theme.