Absolute certainty will always elude us. We will always be mired in error. The most each generation can hope for is to reduce the error. . . .

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.

My own eyes try to sleep, but they don't. They stay wide awake as time snarls forward and silence drops down, like measured thought.

It is always worth asking, "Who speaks through us?

It will take as long as it takes. Your work is to take the time and make the space. Everything else is beyond your influence.

I'm never satisfied with what I do.

Nnothing tends more to the corruption of science than to suffer it to stagnate. These waters must be troubled, before they can exert their virtues.

The year is always correct, also the month, only the day can be another. But that occurs to me only in the moment of writing it down.

We have so many choices that it's only always our fault if we're malcontent.

In general, if signs of sectarianism do appear in a Socialist Party, these are only the products of the absence of a broad Labour movement in the country.

At one time MTV was hip and suddenly it became outdated.