“The capacity of humans to believe in what seems to me highly improbable- from table tapping to the superiority of their children- has never been plumbed.”

“Liberty is never unalienable; it must be redeemed regularly with the blood of patriots or it always vanishes. Of all the so-called natural human rights that have ever been invented, liberty is least likely to be cheap and is never free of cost.”

“Whenever women have insisted on absolute equality with men, they have invariably wound up with the dirty end of the stick. What they are and what they can do makes them superior to men, and their proper tactic is to demand special privileges, all the traffic will bear. They should never settle merely for equality. For women, "equality" is a disaster.”

“I never learned from a man who agreed with me.”

“Seems to be a deep instinct in human beings for making everything compulsory that isn't forbidden.”

“Never underestimate the power of human stupidity.”

“There is a misconception, geocentric and anthropomorphic, common to the large majority the the earthbound, which causes them to visualize a planetary system stereoscopically. The mind's eye sees a sun, remote from a backdrop of stars, and surrounded by spinning apples -- the planets. Step out on your balcony and look. Can you tell the planets from the stars? Venus you may pick out with ease, but could you tell it from Canopus, if you had not previously been introduced? That little red speck -- is it Mars, or is it Antares? Blast for Antares, believing it to be a planet, and you will never live to have grandchildren.”