When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.

Do-gooding is like treating hemophilia - the real cure is to let hemophiliacs bleed to death...before they breed more hemophiliacs.

Life is short, but the years are long.

Almost everything about a human creature is ridiculous, except its ability to suffer bravely and die gallantly for whatever it loves and believes in. The validity of that belief, the appropriateness of that love, is irrelevant; it is the bravery and the gallantry that count.

The price of freedom is the willingness to do sudden battle anywhere, any time and with utter recklessness.

And suddenly I knew I was people and could not stop laughing.

Each man is his own prisoner, in solitary confinement for life.