90% of the mass in your body comes from empty space.

The lack of understanding of something is not evidence for God. It's evidence of a lack of understanding.

The purpose of education is not to validate ignorance but to overcome it.

I like to say that while antimatter may seem strange, it is strange in the sense that Belgians are strange. They are not really strange; it is just that one rarely meets them.

Without science, everything is a miracle.

As a scientist, I don't believe anything. Science shouldn't use the word belief. There are things more likely and less likely. Science can say nothing with absolute certainty.

[The writers of the holy books] did not even know the earth revolves around the sun. Why are we listening?

Forget Jesus. The stars died so that you could be here today.

Keeping religion immune from criticism is both unwarranted and dangerous.

Whatever the evolutionary basis of religion, the xenophobia it now generates is clearly maladaptive.

It is a shame when nonsense can substitute for fact with impunity.

They understood what had really held the market together before. Violence. After all, what good was a debt if the creditor couldn't compel it to be paid?

A lot of positive psychology is stuck in being the psychology of privilege, and I reject that.

You get out there in space and say to yourself: that's home. That's the only home we have, and the only one we're going to have for a long time

True freedom is an inward state of being. Once it is attained, no situation in the world can bind one or limit one's freedom.

All you need to know about Arafat was that he insisted on wearing a pistol when he addressed the UN General Assembly. And all you need to know about the UN, I suppose, is that they let him.

I get overwhelming support in the African-American community.

You must have respect, which is a part of love, for those under your supervision. Then they will do what you ask and more.

I apologize for the fact that the word ‘anti-Mexican’ is being said to a black guy in America.

Only the bold get to the top.

When inspiration dies, imitation thrives.