"If we were all given by magic the power to read each other's thoughts, I suppose the first effect would be almost all friendships would be dissolved; the second effect, however, might be excellent, fo…"

"The opinion that snow is white must be held to show a morbid taste for eccentricity…"

"Science may set limits to knowledge, but it ought not to set limits to imagination."

"I am a mathematician and a logician. I have no emotions. I am a machine. I am a machine to think."

"A habit of basing convictions upon evidence, and of giving to them only that degree of certainty which the evidence warrants, would, if it became general, cure most of the ills from which the world su…"