People who think they know everything are a great annoyance to those of us who do.
The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
It is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.
The true delight is in the finding out rather than in the knowing.
I do not fear computers. I fear the lack of them.
It is not only the living who are killed in war.
Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.
It pays to be obvious, especially if you have a reputation for subtlety.
All sorts of computer errors are now turning up. You'd be surprised to know the number of doctors who claim they are treating pregnant men.
Writing, to me, is simply thinking through my fingers.
Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today - but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all.
Life is pleasant. Death is peaceful. It's the transition that's troublesome.
Self-education is, I firmly believe, the only kind of education there is.
There is a single light of science, and to brighten it anywhere is to brighten it everywhere.
Never let your sense of morals get in the way of doing what's right.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'
John Dalton's records, carefully preserved for a century, were destroyed during the World War II bombing of Manchester. It is not only the living who are killed in war.
And above all things, never think that you're not good enough yourself. A man should never think that. My belief is that in life people will take you at your own reckoning.
To surrender to ignorance and call it God has always been premature, and it remains premature today.
A subtle thought that is in error may yet give rise to fruitful inquiry that can establish truths of great value.