Those who dream of the joys of living in a space colony should live in a space colony.
The most common form of terrorism in the U.S.A. is that carried on by bulldozers and chain saws.
Our big social institutions do not reflect human nature; they distort it.
For this world that men have made, none of us is bad enough. For the world that made us, none is good enough.
All living things on earth are kindred.
Nothing could be more reckless than to base one's moral philosophy on the latest pronouncements of science.