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。 
The beauty of mathematics lies in its ability to reveal the underlying simplicity in what appears to be complex.
The most important thing is to awaken in the child his own will and ability to create.