The greatest of all the accomplishments of 20th century science has been the discovery of human ignorance

It is in our genes to understand the universe if we can, to keep trying even if we cannot, and to be enchanted by the act of learning all the way.

I do not understand modern physics at all, but my colleagues who know a lot about the physics of very small things, like the particles in atoms, or very large things, like the universe, seem to be running into one queerness after another, from puzzle to puzzle.

Everything here is alive thanks to the living of everything else.

If we are to be destroyed we will do it ourselves by warfare with thermonuclear weaponry.

Statistically, the probability of any one of us being here is so small that you'd think the mere fact of existing would keep us all in a contented dazzlement of surprise.

If an idea cannot move on its own, pushing it doesn't help; best to let it lie there.