Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

The ultimate tragedy is not the oppression and cruelty by the bad people but the silence over that by the good people.

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.

在科学中最令人兴奋的短语，预示着新发现的，不是“我找到了！”而是“这很有趣...”