All scientific progress requires a climate of strong skepticism.

If the history of science shows us anything, it is that we get nowhere by labeling our ignorance “God”.

Faith is a padlock of the mind, and few keys can open it.

If the history of science teaches us anything, it is that what conquers our ignorance is research, not giving up and attributing our ignorance to the miraculous work of a creator.

Religion is based on dogma and belief, whereas science is based on doubt and questioning.

We don't have faith in reason; we use reason because, unlike revelation, it produces results and understanding. Even discussing why we should use reason employs reason!

In religion, faith is a virtue. In science, faith is a vice.

Damn, but science is just a constant feed of cool new facts and theories. Theology doesn't come close.

Can a geology teacher blithely tell his students that the earth is flat, or a European history professor that the Holocaust didn't happen? That's not academic freedom, but dereliction of duty.

Evolution tells us where we came from, not where we can go.

We now have many of the answers that once eluded Darwin, thanks to two developments that he could not have imagined: continental drift and molecular taxonomy.

Why do you give way to your ego and pride. Where does it stand in the ocean of time.

There's nothing so heavy as books, sir--unless it's bricks.

Not all poisonous juices are burning or bitter nor is everything which is burning and bitter poisonous.

I felt so much pride, so much love. You get a handful of days like this in a lifetime. Take in every minute. They’ll be over soon enough, and you never know what tomorrow will bring.

There is no death, only a change of worlds.

What is a woman? A woman is chaos. Chaos is the naturally perfect state of all things.

Sometimes, we are so attached to our way of life that we turn down wonderful opportunities simply because don't know what to do with it.

Part of the challenge of innovation is coming up with the problem to solve, not just its solution.

The last living boy in America drops into my bedroom only he wants to be a monk. I think that pretty much sums up my life.

Are you a devious, plotting, unreliable madman? Ah, good, then you can be my most trusted advisor.