Sometimes attaining the deepest familiarity with a question is our best substitute for actually having the answer.

Gravity is matter’s sugar daddy.

Most scientists like to operate in the context of economy. If you don't need an explanatory principle, don't invoke it.

My emotional investment is in finding truth. If string theory is wrong, I'd like to have known that yesterday. But if we can show it today or tomorrow, fantastic.

If string theory is right, the microscopic fabric of our universe is a richly intertwined multidimensional labyrinth within which the strings of the universe endlessly twist and vibrate, rhythmically beating out the laws of the cosmos.

There's a picture of my dorm room in the college yearbook as the most messy, most disgusting room on the Harvard campus, where I was an undergraduate.

The boldness of asking deep questions may require unforeseen flexibility if we are to accept the answers.