We are at a crossroads in human history. Never before has there been a moment so simultaneously perilous and promising. We are the first species to have taken evolution into our own hands.

Somewhere, something incredible is waiting to be known.

It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.

The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.

Imagination will often carry us to worlds that never were. But without it we go nowhere.

I don't want to believe. I want to know.

The absence of evidence is not the evidence of absence.

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.

For small creatures such as we the vastness is bearable only through love.

You have to know the past to understand the present.

When you see, not only intellectually but with your heart too, how we are all connected, how can you harm another? It's the same as harming oneself.

In nuclear war all men are cremated equal.

Creole is New Orleans city food. Communities were created by the people who wanted to stay and not go back to Spain or France.

Don't let anything morph you or push you around or have you be something you're not.

Ambiguity — the Devil's volleyball.

If the men in the room would only think how they would feel graduating with a 'spinster of arts' degree they would see how important this is.

Civil disobedience presupposes willing obedience of our self-imposed rules, and without it civil disobedience would be a cruel joke.

I love Seth Rogen's line in which he talks about how you can be both a genius and decent at the same time.

I don't think I could have dreamt it up any better than how things went, of being at my peak at just the right time, and have everything go my way.

There is many a boy here today who looks on war as all glory, but, boys, it is all hell. You can bear this warning voice to generations yet to come. I look upon war with horror.