Every one of us is precious in the cosmic perspective. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.

We are star stuff which has taken its destiny into its own hands.

If you wish to make an apple pie from scratch, you must first invent the universe.

We have heard the rationales offered by the nuclear superpowers. We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth?

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