Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride or laziness of mind.

Sir Karl Popper (1902-1994) Austrian-British philosopher

(Attributed)

As paraphrased by Ryszard Kapuscinski, "The Philosopher as Giant-Slayer," New York Times Magazine (1 Jan 1995)