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世界所有的前进动力都归功于不安分的人;幸福的人不可避免地把自己限制在古老的界限内。
In the midst of winter, I found there was, within me, an invincible summer.
The most important skill for an empirical researcher is not math, but judgment.
Your most unhappy customers are your greatest source of learning.
The greatest stories are those that remain untold, hidden in the hearts of the people.
"The world is a book, and those who do not travel read only one page."
Software is under a constant tension. Being symbolic it is arbitrarily perfectible; but also it is arbitrarily changeable.