You have all these fragments, like pieces of a puzzle, and you can place them together into large groups, but the groups don't go together no matter how you try, and then suddenly you get one fragment and it fits two different groups and then suddenly the two great groups are one. The relation of the mythos to insanity. That's a key fragment. I doubt whether anyone ever said that before. Insanity is the terra incognita surrounding the mythos. And he knew! He knew the Quality he talked about lay outside the mythos.
Ch. 28 - Zen and the Art of Motorcycle Maintenance (1974)