The strong man is strongest when alone.
强者独处时最为强大。
数学是一门活生生的学科，不断演变和发展。
不作为的代价远大于行动的代价。
The power of positive thinking is the ability to generate a feeling of certainty in yourself when nothing in the environment supports you.
Not what we have, but what we enjoy, constitutes our abundance.
I cannot teach anybody anything。I can only make them think.
"The best way to find yourself is to lose yourself in the service of others."