If you have a high evaluation of yourself then your ability to recognize new facts is weakened. - Robert M. Pirsig

Insanity on the other hand is an intellectual pattern. It may have biological causes but it has no physical or biological reality. No scientific instrument can be produced in court to show who is insane and who is sane. There's nothing about insanity that conforms to any scientific law of the universe. The scientific laws of the universe are invented by sanity. There's no way by which sanity, using the instruments of its own creation, can measure that which is outside of itself and its creations. Insanity isn't an 'object' of observation. It's an alteration of observation itself. There's no such thing as a 'disease' of patterns of intellect. There's only heresy. And that's what insanity really is.

Plato finds it necessary to separate, for example, "horseness" from "horse" and say that horseness is real and fixed and true and unmoving, while the horse is a mere, unimportant, transitory phenomenon. Horseness is pure Idea. The horse that one sees is a collection of changing Appearances, a horse that can flux and move around all it wants to and even die on the spot without disturbing horseness, which is the Immortal Principle and can go on forever in the path of the Gods of old.

We always condemn most in others, he thought, that which we most fear in ourselves.