Mankind which began in a cave and behind a windbreak will end in the disease-soaked ruins of a slum.

Go away. I'm all right. [last words]

The British Islands are small islands and our people numerically a little people. Their only claim to world importance depends upon their courage and enterprise, and a people who will not stand up to the necessity of air service planned on a world scale, and taking over thousands of aeroplanes and thousands of men from the onset of peace, has no business to pretend anything more than a second rate position in the world. We cannot be both Imperial and mean.

This has ever been the fate of energy in security; it takes to art and to eroticism, and then comes languor and decay.

I never yet heard of a useless thing that was not ground out of existence by evolution sooner or later. Did you? And pain gets needless.

Man ... can go up against gravitation in a balloon, and why should he not hope that ultimately he may be able to stop or accelerate his drift along the Time-Dimension, or even turn about and travel the other way.

Men fancied there might be other men upon Mars, perhaps inferior to themselves and ready to welcome a missionary enterprise.