做数学的艺术在于找到包含所有普遍性萌芽的特殊情况。
The art of doing mathematics consists in finding that special case which contains all the germs of generality.
所以富贵的人极其奢侈,二孤儿寡妇却受饥挨饿,虽然想天下不乱,也不可能。国君若真的希望天下太平而不希望天下大乱的话,如果要吃喝,就不能不节俭。
数学家的工作永远不会完成；总有新的问题需要探索，新的谜团需要揭开。
The best forestry practices are those that leave no trace but leave everything changed.
"To write is to remember, and to remember is to live again."