过去总是紧张的，未来是完美的。

It’s not just what you say that stirs people. It’s the way that you say it.

阅读是共情的基础。

The history of all hitherto existing society is the history of class struggles.

释义：天之险在于高不可升，地之险在于山川丘陵。王公设险以保卫国家，险的功用非常大。