The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.

To live under the American Constitution is the greatest political privilege that was ever accorded to the human race.

善于教导的人必须遇到善于学习的人，才能使教育的效果更大。

如果你开心得太久，就会变得平庸。

Data is the new oil, and cloud computing is the new electricity.