Our frustration is greater when we have much and want more than when we have nothing and want some. We are less dissatisfied when we lack many things than when we seem to lack but one thing.

理解数学就是掌握宇宙的语言。

对待心中的欲念，放纵即有所损，所以关键在于忍；改过向善，努力即有所助益，所以关键在于悔。

我们生产的每一件塑料制品都应该有明确的再利用或回收路径。