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

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.

Technology with out humanity is calamity.

The poetical language of an age should be the current language heightened.

Wrong is wrong; no fallacy can hide it, no subterfuge cover it so shrewdly but that the All-Seeing One will discover and punish it.

You read the papers and you watch television, so you know the kind of spider-brained, commercially poisoned piece-of-crap reporting you get in America.

You know. Life's short. If you don't try new things, you'll never know what you're best at. And you can only make time for new things by quitting the things you know don't work for you.

Ego is something that you come to know - something that you befriend by not acting out or by repressing all the feelings that you feel.

We will breakfast together here and dine together in hell.

The meanest hut with love in it is a palace fit for the gods, and a palace without love is a den only fit for wild beasts.

Your problem is not that you are too busy; your problem is that you don't own your situation.

Revolution can never be forecast; it cannot be foretold; it comes of itself. Revolution is brewing and is bound to flare up.