数算练习告诉我们算术运算的原理，而不是单单的记忆和不断演算。
艺术让我们能够直面死亡而不转身逃避。
The secret of success is learning how to use pain and pleasure instead of having pain and pleasure use you. If you do that, you’re in control of your life. If you don’t, life controls you.
一个人做了好事应当忘记，不要念念不忘，更不要希冀别人回报。
Knowledge is the key to unlocking the door to the soul.