Never worry about theory as long as the machinery does what it's supposed to do.

The Earth is just too small and fragile a basket for the human race to keep all its eggs in.

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

I have never been impressed by the formal schools of ethics.

Gratitude: An imaginary emotion that rewards an imaginary behavior, altruism. Both imaginaries are false faces for selfishness, which is a real and honest emotion.

Take care of the cojones and the frijoles will take care of themselves. Try to have getaway money - but don't be fanatic about it.

Jill: 'I don't pay attention to politics.' Ben: 'You should. It's barely less important than your own heart beat.' Jill: 'I don't pay attention to that, either.'