Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
The person who is slowest in making a promise is the most faithful in performance of it.
当遇到反对意见时,即使它可能来自你的丈夫或孩子,也要努力用论证而不是权威去克服它,因为依靠权威的胜利是不可靠而虚妄的。