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

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.

While he lives, he must think; while he thinks, he must dream.

A smile is a light that sets your inner self aglow, letting others know you’re home.

He gives twice who gives quickly.

A frightened captain makes a frightened crew.

The pitcher has to find out if the hitter is timid. And if the hitter is timid, he has to remind the hitter he's timid.

Become someone's hero.

Without being and remaining oneself, there is no love.

To make a relationship work, focus on what you appreciate about the other person, and not your complaints.

I would not have a slave to till my ground, To carry me, to fan me while I sleep, And tremble when I wake, for all the wealth That sinews bought and sold have ever earn'd.

forgive me also that I didn't fight like Lord Byron for the happiness of captive peoples that I watched only risings of the moon and museums