自然界的所有效应都只是少数不变定律的数学结果。
All the effects of Nature are only the mathematical consequences of a small number of immutable laws.
与我们内心的东西相比,我们身后和面前的东西都是微不足道的。
The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.
要明智地管理森林,必须首先学会像森林一样思考。