Spacemen die if they stay in one place.

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.

Consider the black widow spider. It's a timid little beastie, useful and, for my taste, the prettiest of the arachnids, with its shiny, patent-leather finish and its red hourglass trademark. But the poor thing has the fatal misfortune of possessing enormously too much power for its size. So everybody kills it on sight.

With eternity to draw on there could be no reason for hurrying - 'hurry' was not a concept in Martian.

Some people insist that "mediocre" is better than "best." They delight in clipping wings because they themselves can't fly. They despise brains because they have none.

Never cast pearls before swine.

We each have a moral obligation to conserve and preserve beauty in this world; there is none to waste.