Humanity looks to me like a magnificent beginning but not the final word.

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.

One death apiece is plenty.

I regret it when I suppress my feelings too long and they burst forth in ways that are distorted or attacking or hurtful.

We will only grow as big as we dream that's why we must dream big.

Wood halfe burnt is easily kindled. [Wood half-burnt is easily kindled.]

If they try to rush me, I always say, I've only got one other speed and it's slower.

Do not be afraid of defeat. You are never so near victory as when you are defeated in a good cause.

Every man's life lies within the present; for the past is spent and done with, and the future is uncertain.

The Martha Stewart trial makes clear how far women have risen in the business world. America can be proud of our equal-opportunity prosecution and conviction.

I'm just me. If I am sexy, it's just something I do naturally, like picking up a knife and fork to eat. I think people who try to be sexy are the most unsexy people in the world.

Each of us is ultimately alone.