经济模型的价值在于其解释和预测的能力。

Art is a matter of life and death. This could be my last message.

"A well-written biography is a resurrection of the past."

"Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence."

做数学就是与宇宙对话，寻找我们甚至可能还不知道如何提出的问题的答案。

可持续性不是一种风格，而是一种责任。