Within the brains most secret cells — Reason

"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man."

"He, who will not reason, is a bigot; he, who cannot, is a fool; and he, who dares not, is a slave."

"Reason ... contradicts the established order of men and things on behalf of existing societal forces that reveal the irrational character of this order—for “rational” is a mode of thought and action which is geared to reduce ignorance, destruction, brutality, and oppression."

"Setting themselves against reason, as often as reason is against them."

"…He is a weak ruler who needs religion to uphold his government; it is as if he would catch his people in a trap. My people are going to learn the principles of democracy, the dictates of truth and the teachings of science. Superstition must go. Let them worship as they will; every man can follow his own conscience, provided it does not interfere with sane reason or bid him against the liberty of his fellow-men."

"If you will not hear reason, she will surely rap your knuckles."