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The real tragedy of the poor is that they can afford nothing but self-denial.

思考是提升靈魂的一種方式，通過思辨，人類能夠更深刻地理解宇宙之謎。

我們這個時代的真正建筑將是反映我們精神需求的建筑。

學習數學的唯一方法就是做數學。

Ninety-nine percent of the troubles that threaten our civilization come from too optimistic, therefore we should have a system where the accounting is a way more conservative.

Dreams are the seeds of greatness, but hard work is what makes them grow.

The structure of the international system, not the intentions of individual states, is the primary determinant of state behavior.