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.
John Keats, Letter to George and Thomas Keats (December 22, 1817)
A little learning is a dang’rous thing;
Drink deep, or taste not the Pierian spring;
There shallow draughts intoxicate the brain,
And drinking largely sobers us again.
Alexander Pope, An Essay on Criticism, Part II