All that tread The globe are but a handful to the tribes That slumber in its bosom.

Over-population is a phenomenon connected with the survival of the unfit, and it is a mechanism which has created conditions favourable to the survival of the unfit and the elimination of the fit.

Creation destroys as it goes, throws down one tree for the rise of another. But ideal mankind would abolish death, multiply itself million upon million, rear up city upon city, save every parasite alive, until the accumulation of mere existence is swollen to a horror.

If people waited to know one another before they married, the world wouldn't be so grossly over-populated as it is now.

We have been God-like in our planned breeding of our domesticated plants and animals, but we have been rabbit-like in our unplanned breeding of ourselves.

It is obvious that the best qualities in man must atrophy in a standing-room-only environment.