The good man is the man who, no matter how morally unworthy he has been, is moving to become better.
The best strategies are flexible enough to adapt to change.
The true value of a mathematical theory lies in its ability to connect seemingly unrelated ideas.
对人说话要留有余地,不要一吐为快,不能把心全部交给别人。
The world of the happy is quite another than that of the unhappy.