"In the part of this universe that we know there is great injustice, and often the good suffer, and often the wicked prosper, and one hardly knows which of those is the more annoying."

"War, as I remarked a moment ago, has hitherto been disappointing in this respect, but perhaps bacteriological war may prove more effective. If a Black Death could be spread throughout the world once i…"

"There is a great deal of difference between an open mind and an empty head."

"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."

"The Eugenic Society . . . is perpetually bewailing the fact that wage-earners breed faster than middle-class people."