数学不知道种族或地理边界；对于数学来说，文化世界是一个国家。
Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.
Freedom is the recognition of necessity.
一本好书的衡量标准在于它是否能让你思考、感受并以不同的方式看待世界。
The art of doing mathematics consists in finding that special case which contains all the germs of generality.
In business, if you're not moving forward, you're falling behind.