Maybe we can comprehend a flower or an insect, but we can never comprehend ourselves. Even less can we expect to comprehend the universe.

A state that does not educate and train women is like a man who only trains his right arm.

A hydrogen atom in a cell at the end of my nose was once part of an elephant's trunk. A carbon atom in my cardiac muscle was once in the tail of a dinosaur.

How terribly sad it was that people are made in such a way that they get used to something as extraordinary as living.

The most subversive people are those who ask questions.

An answer is always on the stretch of road that is behind you. Only a question can point the way forward.

The question of whether a thing is right or wrong, good or bad, must always be considered in relation to a persons needs.

Wasn’t it extraordinary to be in the world right now, wandering around in a wonderful adventure!

Since the Renaissance, people have had to get used to living their life on a random planet in the vast galaxy.

We are thrown together with a sprinkling of stardust.

Athens is like a sluggish horse, and I am the gadfly trying to sting it into life.

We are not to be occupied with our feelings or symptoms, or our faith or lack of faith, but only with what God has said

If you're being attacked from all sides, it's possible you're doing something right; it's also possible that you are doing everything wrong.

I manage my time by prioritizing tasks, working smarter not harder, and by avoiding procrastination.

It was possible that I'd thrown one too many Molotov cocktails over God's fence.

But the power of science lies in open publication, which, with the rise of the Internet, is no longer constrained by the price of paper.

Wherever the truth is injured, defend it.

My advice would be the same advice that I gave President [George W.] Bush when he won in '04, and, kind of, wasn't followed. I think you go with the things you know you can pass.

A lady is a woman who makes a man behave like a gentleman.

It’s not wondering what I breathe in, but who, that threatens to choke me.

As chairman of the Senate subcommittee responsible for NASA appropriations, I say not a penny for this nutty fantasy.