There is no despair so absolute as that which comes with the first moments of our first great sorrow, when we have not yet known what it is to have suffered and be healed, to have despaired and have recovered.

你看不见你自己，你所看见的只是你的影子。

判断两个λ表达式是否等价的问题是无法解决的。

已经拥有许多而想拥有更多的人，其失意感耍大于一无所有而只想拥有一点点的人。另外，只缺一样东西的人也会比缺很多东西的人更不满。