历史中的优点似乎有三种，一种是来自气候和国家的纯粹地理位置，一种是来自政府形式和人民性格，一种是来自那些更细致的哲学原则和道德，可以称为哲学的推荐。
The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.
The greatest reward in research is knowing that your work can save lives.
One of the best rules anybody can learn about investing is to do nothing, absolutely nothing, unless there is something to do... I just wait until there is money lying in the corner, and all I have to do is go over there and pick it up.
如果你想走得快，独自前行；如果你想走得远，结伴同行。
Everything can be taken from a man but one thing: the last of the human freedoms—to choose one's attitude in any given set of circumstances.