We simply don't know yet what's going to happen to the carbon in the atmosphere.

You ask: what is the meaning or purpose of life? I can only answer with another question: do you think we are wise enough to read God's mind?

The greatest unsolved mysteries are the mysteries of our existence as conscious beings in a small corner of a vast universe.

If you want to have a program for moving out into the universe, you have to think in centuries not in decades.

A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.

The idea that global warming is the most important problem facing the world is total nonsense and is doing a lot of harm.

Unfortunately the global warming hysteria, as I see it, is driven by politics more than by science.

In the end it is how you fight, as much as why you fight, that makes your cause good or bad.

So long as you have courage and a sense of humor, it is never too late to start life afresh.

Technology is a gift of God. After the gift of life it is perhaps the greatest of God's gifts. It is the mother of civilizations, of arts and of sciences.

Courage is feeling fear, not getting rid of fear, and taking action in the face of fear.

Whoever wishes peace among peoples must fight statism.

For a genius thief you really are a stupid girl aren't you?

Scheduling flexibility is the single greatest non-financial tool -- and the number-one dream-job factor -- at your disposal for winning battles in the talent wars. Use it.

Swearing is an art form. You can express yourself much more exactly, much more succinctly, with properly used curse words.

Be prepared to go mad with fixed rule and method.

The reason for the slow progress of the world seems to lie in a single fact. Every man is born under the yoke, and grows up beneath the oppressions of his age.

I think we are destroying the minds of America and that has been one of my lifelong ambitions.

Nothing anyone says in a bar is true.

The most successful people in the world are people who were rejected more than anybody else.