What we learn from history is that people don't learn from history.
最有效的领导者是那些能够授权他人去领导的人。
No man is fit to hold office who isn't perfectly willing to leave it at any time...
The true meaning of life is to plant trees under whose shade you do not expect to sit.
在数学中，提出问题的艺术必须比解决问题更有价值。