One can only learn by teaching.

Behind it all is surely an idea so simple, so beautiful, that when we grasp it - in a decade, a century, or a millennium - we will all say to each other, how could it have been otherwise? How could we have been so stupid?

If you haven't found something strange during the day, it hasn't been much of a day.

In any field, find the strangest thing and then explore it.

We live on an island surrounded by a sea of ignorance. As our island of knowledge grows, so does the shore of our ignorance.

We will first understand how simple the universe is when we recognize how strange it is.

Surely where there's smoke there's fire? No, where there's so much smoke there's smoke.