Grip the nettle firmly and it will become a stick with which to beat your enemy.

Any teacher that can be replaced by a computer should be replaced by a computer.

All roads lead to Trantor, says the old proverb, and that is where all stars end.

Surely no child, and few adults, have ever watched a bird in flight without envy.

People who think they know everything are a great annoyance to those of us who do.

The human brain, then, is the most complicated organization of matter that we know.

It was obvious that bigotry was never a one-way operation, that hatred bred hatred!

I have never written a book that didn't teach me far more than it taught my reader.

Robots will neither be common nor very good in 2014, but they will be in existence.

True literacy is becoming an arcane art, and the nation is steadily "dumbing down."

To make discoveries, you have to be curious about why the universe is the way it is.

If knowledge can create problems, it is not through ignorance that we can solve them.

Science can amuse and fascinate us all, but it is engineering that changes the world.

I made up my mind long ago to follow one cardinal rule in all my writing — to be clear.

If you have talent, you will receive some measure of success - but only if you persist.

Gratitude is best and most effective when it does not evaporate itself in empty phrases.

The facts, gentlemen, and nothing but the facts, for careful eyes are narrowly watching.

Night will always be a time of fear and insecurity, and the heart will sink with the sun.

There seems to be a feeling that anything that is natural is good. Strychnine is natural.

Married life had taught Toran the futility of arguing with a female in a dark-brown mood.

Having no unusual coincidence is far more unusual than any coincidence could possibly be.

All you have to do is take a close look at yourself and you will understand everyone else.

In the presence of total Darkness, the mind finds it absolutely necessary to create light.

Every religion seems like a fantasy to outsiders, but as holy truth to those of the faith.

Love life seems to be that factor which requires the largest quantity of magical tinkering.

I never considered myself a patriot. I like to think I recognize only humanity as my nation.

The cure for advanced gullibility is to go to sleep and consider matters again the next day.

Courtiers don't take wagers against the king's skill. There is the deadly danger of winning.

You can prove anything you want by coldly logical reason---if you pick the proper postulates.

There is a single light of science, and to brighten it anywhere is to brighten it everywhere.

It is change continuing change, inevitable change that is the dominant factor in society today.

[O]ur statesmen, our businessmen, our everyman must take on a science fictional way of thinking.

A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster.

It's your fiction that interests me. Your studies of the interplay of human motives and emotion.

Scientists derive satisfaction from figuring out the puzzle. It's about the quest, not the grail.

Working ten hour days allows you to fall behind twice as fast as you could working five hour days.

It's humbling to think that all animals, including human beings, are parasites of the plant world.

Politically popular speech has always been protected: even the Jews were free to say ‘Heil Hitler.’

Postulates are based on assumption and adhered to by faith. Nothing in the Universe can shake them.

To surrender to ignorance and call it God has always been premature, and it remains premature today.

Any fool can tell a crisis when it arrives. The real service to the state is to detect it in embryo.

It's not so much what you have to learn if you accept weird theories, it's what you have to UNlearn.

If there is a category of human being for whom his work ought to speak for itself, it is the writer.

We all know we fall. Newton's discovery was that the moon falls, too-and by the same rule that we do.

Radiation, unlike smoking, drinking, and overeating, gives no pleasure, so the possible victims object.

If all human beings understood history, they might cease making the same stupid mistakes over and over.

Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.

It was childish to feel disappointed, but childishness comes almost as naturally to a man as to a child.

The closer to the truth, the better the lie, and the truth itself, when it can be used, is the best lie.

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