"The number of children born from educated parents is much too small."

"Needless to say, taken literally, this is just as absurd. For an adult organism the energy content is as stationary as the material content. Since, surely, any calorie is worth as much as any other ca…"

"The important thing is not to stop questioning."

"God's existence or non-existence, and the validity of moral laws, are not matters for scientific inquiry."

"By the way, I never realized that to be nonbelieving, to be an atheist, was a thing to be proud of. It went without saying as it were."