We do not know how much of the environmental change is due to human activities and how much [is due] to long-term natural processes over which we have no control.

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.

People with a psychological need to believe in marvels are no more prejudiced and gullible than people with a psychological need not to believe in marvels.

No kindness is ever wasted, nor can we ever tell how much good may come of it.

There is no ethics in general. There are only-eventually-ethics of processes by which we treat the possibilities of a situation.

A comely female inhabiting the Mohammedan Paradise to make things cheery for the good Mussulman, whose belief in her existence marks a noble discontent with his earthly spouse, whom he denies a soul.

Capitalists behave like capitalists wherever they are. They pursue the expansion of value through exploitation without regard to the social consequences.

Being a Celtic supporter is not always easy, but it is always worthwhile.

I think if you talk to my colleagues, I was less than a fearsome individual.

I've always essentially been a New Yorker.

This very moment is a seed from which the flowers of tomorrow's happiness grow.

I have never figured out how women work but I do know that their skin color has no significance. Black or white, every last one is pretty pink on the inside and they are all impossible.