Do not feel envious of the happiness of those who live in a fool’s paradise, for only a fool will think that it is happiness.
勿羡慕那些生活在愚昧“天堂”的人们,因为只有愚人才认为那里是幸福的。
每个圣人都有过去,每个罪人都有未来。
所以,父母、老师、国君三者,都不能当作做事的法度。 
Mathematics is the art of turning complexity into clarity.
Your 20s are the most defining decade of your life.