Never let your sense of morals prevent you from doing what is right.
Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.
People who think they know everything are a great annoyance to those of us who do.
I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.
There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no humanity.
It has been my philosophy of life that difficulties vanish when faced boldly.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'
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.
Anything you make forbidden gains sexual attractiveness. Would you be particularly interested in women's breasts if you lived in a society in which they were displayed at all times?
Science is a mechanism, a way of trying to improve your knowledge of nature. It's a system for testing your thoughts against the universe, and seeing whether they match.
You don't need to predict the future. Just choose a future - a good future, a useful future - and make the kind of prediction that will alter human emotions and reactions in such a way that the future you predicted will be brought about. Better to make a good future than predict a bad one.
If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster.
Violence is the last refuge of the incompetent.
While he lives, he must think; while he thinks, he must dream.
Every religion seems like a fantasy to outsiders, but as holy truth to those of the faith.
There are no happy endings in history, only crisis points that pass.
Once you get it into your head that somebody is controlling events, you can interpret everything in that light and find no reasonable certainty anywhere.
People think of education as something they can finish.
So the universe is not quite as you thought it was. You'd better rearrange your beliefs, then. Because you certainly can't rearrange the universe.
The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
When stupidity is considered patriotism, it is unsafe to be intelligent.
The day you stop learning is the day you begin decaying.
The great secret of the successful fool is that he's no fool at all
There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge.
Today's science fiction is tomorrow's science fact.
Any teacher that can be replaced by a computer should be replaced by a computer.
Jokes of the proper kind, properly told, can do more to enlighten questions of politics, philosophy, and literature than any number of dull arguments.
I am not a speed reader. I am a speed understander.
My feeling is, quite simply, that if there is a God, He has done such a bad job that he isn't worth discussing.
There is no right to deny freedom to any object with a mind advanced enough to grasp the concept and desire the state. -(from "The Bicentennial Man) story)
Custom is second nature. Be accustomed to a bald head, sufficiently accustomed, and hair on it would seem monstrous.
It is not so much that I have confidence in scientists being right, but that I have so much in nonscientists being wrong.
It pays to be obvious, especially if you have a reputation for subtlety.
Robots will neither be common nor very good in 2014, but they will be in existence.
I have never, in all my life, not for one moment, been tempted toward religion of any kind. The fact is that I feel no spiritual void. I have my philosophy of life, which does not include any aspect of the supernatural and which I find totally satisfying. I am, in short, a rationalist and believe only that which reason tells me is so.
There is no belief, however foolish, that will not gather its faithful adherents who will defend it to the death.
...democracy cannot survive overpopulation. Human dignity cannot survive it. Convenience and decency cannot survive it. As you put more and more people into the world, the value of life not only declines, it disappears. It doesn't matter if someone dies. The more people there are, the less one individual matters.
There is a single light of science, and to brighten it anywhere is to brighten it everywhere.
... you just can't differentiate between a robot and the very best of humans.
He always pictured himself a libertarian, which to my way of thinking means "I want the liberty to grow rich and you can have the liberty to starve". It's easy to believe that no one should depend on society for help when you yourself happen not to need such help.