I don't regret the things I've done, I regret the things I didn't do.

Sometimes it seems as if there are more solutions than problems. On closer scrutiny, it turns out that many of today's problems are a result of yesterday's solutions.

我相信伟大的教师就是伟大的艺术家，而且这样的艺术家和其他任何伟大的艺术家一样稀少。教学甚至可能是最伟大的艺术，因为它的媒介是人的思想和精神。

"To read is to travel without moving, to live a thousand lives in one."

I could not have parted with you, my Lizzy, to anyone less worthy.