We have entered, almost without noticing, an age of exploration and discovery unparalleled since the Renaissance.

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.

All that is not eternal is eternally out of date.

The day of judgment is either approaching or it is not. If it is not, there is no cause for adjournment. If it is, I choose to be found doing my duty. I wish therefore that candles may be brought.

It seems to me that the problem with diaries, and the reason that most of them are so boring, is that every day we vacillate between examining our hangnails and speculating on cosmic order.

Happiness is living by inner purpose.

I've always watched actors on the red carpet getting drunk and making idiots of themselves and now I'm happy to join their ranks

The seeker is that which is being sought.

[on sexual politics] The Golden Rule works for men as written, but for women it should go the other way around. We need to do unto ourselves as we do unto others.

It is impossible to dissociate an individual from the environment of which he is a part. No story of achievement should ever be removed from its broader social context.

Not where I breathe, but where I love, I live.

Man cannot change or escape his time. The eye sees the present and the future