The only limit to our realization of tomorrow will be our doubts of today.
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people die tomorrow night, so don't give up today.
The only way to learn mathematics is to do mathematics.
In mathematics, the art of proposing a question must be held of higher value than solving it.
释义:他人胜过自己无妨,对方不会有怨恨;自己胜过他人非福,可能招致灾祸。