A fanatic is a man who, when he's lost sight of his purpose, redoubles his effort..

The fish that first ventured ashore had considerable practical problems..

A man isn't really alive till he has something bigger than himself and his own little happiness, for which he'd gladly die..

Machines can only find what ignorant men have programmed them to find..

The single definition of government I've ever seen that makes sense is that it's the organization which claims the right to kill people who won't do ….

There are some ideas so stupid that only intellectuals can believe in them, particularly left-wing intellectuals..

Give fear no hold on you. Keep sinews loose and senses open, ready at every instant to flow with the rush of action..

Timidity can be as dangerous as rashness..

Let us settle down to the serious business of getting drunk..

I have yet to see any problem, however complicated, which, when you looked at it in the right way, did not become still more complicated..

I wrote the first book, Harvest of Stars, and as I was writing it, I saw that certain implications had barely been touched on... It's perfectly obvio….

Happier are all men than the dwellers in Faerie – or the gods, for that matter…Better a life like a falling star, bright across the dark, than a deat….

Better a life like a falling star, brief bright across the dark, than the long, long waiting of the immortals, loveless and cheerlessly wise..

In Harvest of Stars, there is this notion, not original with me of course, that it will become possible to download at least the basic aspects of a h….

Anybody can find infinite Mandelbrot figures in his navel..

A fanatic's willingness to kill or be killed in the service of a cause cannot prove the rightness of that cause..

These lands are not always calm. We may well have more adventures ahead of us. But we shall meet them with high hearts..

My knowledge of the human psyche is as yet imperfect. Certain areas won't yield to computation..

What five books would I like to be remembered for? Well... Tau Zero, I like that one especially. It was somewhat of a tour de force, and I think it g….

If we knew exactly what to expect throughout the Solar System, we would have no reason to explore it..

Two lives met across death and centuries. To ask what it meant is meaningless. There is no destiny. But sometimes there is bravery.