Arthur Clarke says that I am first in science and second in science fiction in accordance with an agreement we have made. I say he is first in science fiction and second in science.

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.

When stupidity is considered patriotism, it is unsafe to be intelligent.

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.

In life, unlike chess, the game continues after checkmate.

People think of education as something that they can finish.

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.

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

Violence is the last refuge of the incompetent.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

Getting weak is easy. It's staying strong that makes you.

Before you save the world, make sure your own house is in order.

Trust God, He will care for your every need.

You proved to be worthy of my devotion. Of Death’s...love

Wherever I find envy I take a pleasure in provoking it: I always praise before an envious man those who make him grow pale.

Perennials are the ones that grow like weeds, biennials are the ones that die this year instead of next and hardy annuals are the ones that never come up at all.

I like people who like Plato.

I'd rather be this walking metamorphosis than having that old formed opinion about everything.

They paid the ultimate price and we can never forget their sacrifice.

It is here that we encounter the central theme of existentialism: to live is to suffer, to survive is to find meaning in the suffering.