If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers.

For most of human history we have searched for our place in the cosmos. Who are we? What are we? We find that we inhabit an insignificant planet of a hum-drum …

We embarked on our cosmic voyage with a question first framed in the childhood of our species and in each generation asked anew with undiminished wonder: What …

Imagination will often carry us to worlds that never were. But without it we go nowhere.

For me there are no answers, only questions, and I am grateful that the questions go on and on. I don't look for an answer, because I don't think there is one.…

What of it? We call them brave perhaps? Yes; what if the time should come when no one will fight for anything and there's nothing of worth to save.

'Think,' I told him, 'what may be waiting for you. You may discover the meaning of Spirit. You may open up a new world, as rich as the old one, but imperishabl…