未说出口的往往最有力量。

"A story should have a beginning, a middle, and an end—but not necessarily in that order."

The teacher should not teach as if he were pouring knowledge into an empty vessel, but rather as if he were lighting a fire.

I don't believe in anything, and that's the only thing I believe in.

判断两个λ表达式是否等价的问题是无法解决的。