I believe our future depends powerfully on how well we understand this cosmos in which we float, like a mote of dust in the morning sky.

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.

Judge not lest ye be judged yourself.

There is a great potential in everyone.

A prophet is not without honour save in his own country.

A lot of sequins for New Year's! Red, green, white - I fail at all of that because I'm always in black. But for Christmas, I do love wearing cute dresses with tights and a pair of boots.

We also know that China and India, as their economies ramp up, are using more and more energy.

Australia is a huge rest home, where no unwelcome news is ever wafted on to the pages of the worst newspapers in the world.

My history teacher was so old, he taught from memory.

One's real worth is never a quantifiable thing.

It is incident to physicians, I am afraid, beyond all other men, to mistake subsequence for consequence.