Looking up into the night sky is looking into infinity — distance is incomprehensible and therefore meaningless

This man is the bee's knees, Arthur, he is the wasp's nipples. He is, I would go so far as to say, the entire set of erogenous zones of every major flying insect of the Western world.

One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with.

I am terribly proud of-I was born in Cambridge in 1952 and my initials are DNA!

It startled him even more when just after he was awarded the Galactic Institute's Prize for Extreme Cleverness he got lynched by a rampaging mob of respectable physicists who had finally realized that the one thing they really couldn't stand was a smart-ass.

I've come up with a set of rules that describe our reactions to technologies: 1. Anything that is in the world when you’re born is normal and ordinary and is just a natural part of the way the world works. 2. Anything that's invented between when you’re fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. 3. Anything invented after you're thirty-five is against the natural order of things.

I only know as much about myself as my mind can work out under its current conditions. And its current conditions are not good.