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

When the need arises - and it does - you must be able to shoot your own dog. Don't farm it out — that doesn't make it nicer, it makes it worse.

Specialization is for insects... The race of man? He's a whole other creature.

You got the impression that he never needed to sleep - just ten-thousand-mile checkups and dust him off occasionally.

Brainpower is the scarcest commodity and the only one of real value.

Never attribute to malice that which can be adequately explained by stupidity. Never underestimate the power of human stupidity.

Faith strikes me as intellectual laziness.