The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
The best way to learn mathematics is to do mathematics.
We perceive the world in terms of its utility for our survival.
世界这么大,人生这么长,总会有这么一个人,让你想要温柔地对待。
The human being is always more than what he has done; he is also what he can do.