数学证明的美在于它的简洁性和必然性。

It's perhaps easier now than ever before to make a good living. It's perhaps harder than ever before to stay calm, to be free of career anxiety. I want to look now, if I may, at some of the reasons why we might be feeling anxiety about our careers. Why we might be victims of these career crises, as we're weeping softly into our pillows. One of the reasons why we might be suffering is that we are surrounded by snobs.

勇气是人类最重要的一种特质，倘若有了勇气，人类其他的特质自然也就具备了。