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.
一件事情都不能做到有始有终，就不要去操持其他的事情；一物也不明白，就不要追求博闻广记。
The moment we want to believe something, we suddenly see all the arguments for it, and become blind to the arguments against it.
Challenge the status quo, but respect the wisdom of those who came before you.