From Stewart Firestein’s Ignorance: How It Drives Science:
The poet John Keats hit upon an ideal state of mind for the literary psyche that he called Negative Capability – “that is when a man is capable of being in uncertainties, Mysteries, doubts without an irritable reaching after fact and reason”…Scientists do reach after fact and reason, but it is when they are most uncertain that the reaching is most imaginative. Erwin Schrödinger, one of the great philosopher-scientists, says, “In an honest search for knowledge you quite often have to abide by ignorance for an indefinite period”… Being a scientist requires having faith in uncertainty, finding pleasure in mystery, and learning to cultivate doubt. There is no surer way to screw up an experiment than to be certain of its outcome.
Nobel Prize-winning neuroscientist Eric Kandel’s 
