The politicians and the religious leaders and the weapons scientists have been at it for a long time and they've made a thorough mess of it. I mean, we're in deep trouble.

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.

[T]hose who willed the means and wished the ends are not absolved from guilt by the refusal of reality to match their schemes.

Sometimes people who are never alone are the loneliest, don't you think so?

If you want sweet dreams, you've got to live a sweet life.

We advocate biodiversity for biodiversity's sake. It may take our extinction to set things straight.

They might see that you are going to meet a beautiful woman or a beautiful man. They will come to you in dreams and tell you this is going to happen because of them.

In dire economic times, movies are relatively inexpensive entertainment for the whole family.

So he with difficulty and labour hard Mov'd on, with difficulty and labour he.

Know what you want, decide when you want it, figure your plan of action, follow through on it, and never doubt.

That's sexism, that is. Going around giving people girly presents just because they're a girl.

If you do something positive, something positive will come back to you. If you consciously do negative things, then negativity will rule your life.