The true value of a forest cannot be measured in board feet alone.
The best economic insights come from observing how people actually behave.
不了解人的缺点,不了解人的优点,不了解人优点中的缺点,不了解人缺点中的优点,就不可以随便用人,不可以随便教人。
所以,父母、老师、国君三者,都不能当作做事的法度。 
Always think long-term. Short-term gains can lead to long-term losses.