Ask not what your country can do for you --ask what you can do for your country.

The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.

  一切迷信的根源在于人们只关注事情成功的时候，而不关注失败，他们只记住成功，而忽视失败。

不平等的代价不仅由处于劣势的人承担，而是由整个社会承担。

衡量矿业公司成功的真正标准不仅在于其财务报表，还在于它对社区留下的持久积极影响。

The ability to accept responsibility is the measure of the man.