I dislike frontiers, political or intellectual, and I find that ignoring them is an essential catalyst for creative thought. Ideas should flow without hindrance in their natural course.

Would you rather be deaf or blind?

The aim of mathematics is to explain as much as possible in simple terms.

Any good theorem should have several proofs, the more the better.

There is no clear-cut distinction between example and theory

Why is this so hard?” I whispered.His pulse leaped crazily at my admission. “Everything worth fighting for is hard.

Happiness is the inner perception of calmness, tranquility and joy.

I don't concentrate on things I can't do. I do what I can do.

We can, if we so choose, wander aimlessly over the continent of the arbitrary. Rootless as some winged seed blown about on a serendipitous spring breeze.

The idle man does not know what it is to enjoy rest, for he has not earned it.

Take what's useful, leave out what's useless, and add a bit of yourself!

Blushes cannot be counterfeited.

I've become a captive of my own ambitions.

Allowing someone else to make us happy will make them happy too.

How many people have you made homesick for God?