就像虎的外形好画，虎的骨骼难画一样，人的外表好认，人心却难了解。

The principle goal of education is to create men who are capable of doing new things, not simply repeating what other generations have done.

如果不衡量影响，我们只是在猜测可持续性。

最小的人类不可分割单位是两个人，而不是一个人。