To succeed, planning alone is insufficient. One must improvise as well.

The dangers that face the world can, every one of them, be traced back to science. The salvations that may save the world will, every one of them, be traced back to science.

To surrender to ignorance and call it God has always been premature, and it remains premature today.

Intelligence is an accident of evolution, and not necessarily an advantage.

The Earth should not be cut up into hundreds of different sections, each inhabited by a self-defined segment of humanity that considers its own welfare and its own "national security" to be paramount above all other consideration.

It is remarkable, Hardin, how the religion of science has grabbed hold.

Naturally, since [the Sumerians] didn't know what caused the flood anymore than we do, they blamed the gods. (That's the advantage of religion. You're never short an explanation for anything.)