A scientist is as weak and human as any man, but the pursuit of science may ennoble him even against his will.

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.

Life is a long travel. The end of the journey is often unpredictable.

Nothing is illegal so long as you correct it before the SEC catches it.

Wish for the best, prepare for the worst

[Buddhism] takes us beyond a kind of self-centered narcissism because instead of identifying with the content of our experience, we identify with awareness itself.

Music washes away from the soul the dust of everyday life.

Before you tell me what you teach and preach, show me how you live and give.

Although professionals are able to extract a considerable amount of wealth from amateurs, few stock pickers, if any, have the skill needed to beat the market consistently, year after year.

Sports are my life. It is my life but it's also how I earn a living.

Who would you die for? Who would you wake up at five forty-five in the morning for even though you don't even know why he needs you?

I give out Atlas Shrugged as Christmas presents, and I make all my interns read it.