"The desire for safety stands against every great and noble enterprise."

"I should not hold it desirable that either a man or a woman should enter upon the serious business of a marriage intended to lead to children without having had previous sexual experience."

"I am a mathematician and a logician, and I do not find it easy to be human."

"The time has already come when each country needs a considered national policy about what size of population, whether larger or smaller than at present or the same, is most expedient. And having settl…"

"It is possible that mankind is on the threshold of a golden age; but, if so, it will be necessary first to slay the dragon that guards the door, and this dragon is religion."