“The rationalist imagines an imbecile-free society; the empiricist and imbecile-proof one, or even better, a rationalist-proof one.”

“It is better for all the world, if instead of waiting to execute degenerate offspring for crime or to let them starve for their imbecility, society can prevent those who are manifestly unfit from continuing their kind. The principle that sustains compulsory vaccination is broad enough to cover cutting the fallopian tubes. Three generations of imbeciles are enough.”

“Freedom of mind is the real freedom. A person whose mind is not free though he may not be in chains, is a slave, not a free man. One whose mind is not free, though he may not be in prison, is a prisoner and not a free man. One whose mind is not free though alive, is no better than dead. Freedom of mind is the proof of one's existence.”

“Love wasn't rational; there was no proof that it even existed outside of people's imaginings.”

“There comes a time when one must be strong with rationalists, for they can reduce anything whatever to dust, if they happen not to like the look of it, or if it threatens their deep-buried negativism. I mean of course rationalists like you, who take some little provincial world of their own as the whole of the universe and the seat of all knowledge.”

“A true rationalist ought to be effective in the real world.”