All civilizations become either spacefaring or extinct.

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.

A man dies when hope flies.

Everyone is struggling under stress and fear. Only with right attitude we can avoid regrets.

Who has time to make up stories when the truth is so much more interesting?

While I was in high school, I started working professionally and got an agent.

The two things, love and snow, that make the world look fresh again

Plenty of men can do good work for a spurt and with immediate promotion in mind, but for promotion you want a man in whom good work has become a habit.

Ideas are easy. Execution is everything. It takes a team to win.

There's one thing I never did do, and that was stink.

So, twice a week, I go to a beauty salon and have my hair blown dry. It’s cheaper by far than psychoanalysis, and much more uplifting.

Love makes intellectual pretzels of us all.