The true strength of rulers and empires lies not in armies or emotions, but in the belief of men that they are inflexibly open and truthful and legal. As soon as a government departs from that standard it ceases to be anything more than 'the gang in possession,' and its days are numbered.

I am for world-control of production and of trade and transport, for a world coinage, and the confederation of mankind. I am for the super-State.

Everyone leaves the world a little better some by leaving.

Strength is the outcome of need.

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.

When the history of civilization is written, it will be a biological history and Margaret Sanger will be its heroine.

A day will come when beings, now latent in our thoughts and hidden in our loins, shall stand upon Earth as a footstool and laugh, and reach out their hands amidst the stars.