Fall in love with some activity, and do it! Nobody ever figures out what life is all about, and it doesn't matter. Explore the world. Nearly everything is really interesting if you go into it deeply enough. Work as hard and as much as you want to on the things you like to do the best. Don't think about what you want to be, but what you want to do. Keep up some kind of a minimum with other things so that society doesn't stop you from doing anything at all.

There's plenty of room at the bottom.

As revealed by physics, the truth is so remarkable, so amazing!

I'm smart enough to know that I'm dumb.

That is the logical tight-rope on which we have to walk if we wish to interpret nature.

We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty.

The highest forms of understanding we can achieve are laughter and human compassion.