Rationality (n.) can never be universally valid, but which occurs, if at all, then only in small local pockets, as temporary or provisional creations of value by living things.
Rationality (n.) is an illusion that has helped humanity survive, for it has protested over the far greater danger of madness, i.e. the eruption of arbitrariness in feeling, seeing, and hearing, the enjoyment of the mind's lack of discipline, the joy in human unreason.
Rationality (n.) cannot be what the world eternally is — the piece of it we know, our own, is not so very rational.
Rationality (n.) seeps into everything that lives long, until its origin in unreason becomes improbable — which is why every precise history of an origin sounds offensive.
Rationality (n.) arrived in the world irrationally, as might be expected: by a chance accident.
Rationality (n.) is the one thing impossible with all things; a bit of reason is mixed in like sourdough — for the sake of folly.
Rationality (n.) pushed forward restores new strength to its opposite — mysticism and folly of all kinds.