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We are like travelers who have lost their way； we must ask， each one， for directions from a passerby.

If knowledge can create problems, it is not through ignorance that we can solve them.

Greatness is a lot of small things done well, day after day.

概率論歸根結底不過是常識的微積分化。

Knowledge and human power are synonymous.

Life is what happens when you’re busy making other plans.

智力的衡量標準是改變的能力。