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"To be hopeful in bad times is not just foolishly romantic. It is based on the fact that human history is a history not only of cruelty, but also of compassion, sacrifice, courage, kindness."

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.

科学无国界，因为知识属于人类，是照亮世界的火炬。

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

I was in the middle before I knew that I had begun.