世界不是模型，模型只是模型。
译文：机遇不能白白错过，好时机不会每次都来。
The organism learns not only what to do but also what leads to what.
The natural and moral world is the two-fold object of man's rational care.
The difference between an ordeal and an adventure is your attitude.
我们都只是曾经存在的某种东西的回声。
Intelligence plus character – that is the goal of real education.