The object of studying philosophy is to know one's own mind, not other people's.

To become a popular religion, it is only necessary for a superstition to enslave a philosophy.

Events in the past may be roughly divided into those which probably never happened and those which do not matter.

Worry is interest paid on trouble before it comes due.

You have to know evolution to understand the natural world. And that cannot be a threat to people of faith. There's a serious problem if you are forced by your faith to reject the most well-supported theory in all of science.

Science will explain how but not why. It talks about what is, not what ought to be. Science is descriptive, not prescriptive; it can tell us about causes but it cannot tell us about purposes. Indeed, science disavows purposes.

Whenever I think of how much pleasure I have interviewing scientists, I remember that they're having the real fun in actually being able to do the science.

We must accept what science tells us, that man was born from the earth. But, more logical than the scientists who lecture us, we must carry this lesson to its conclusion: that is to say, accept that man was born entirely from the world - not only his flesh and bones but his incredible power of thought.