在数学中，你并不理解事物。你只是习惯了它们。
In mathematics, you don't understand things. You just get used to them.
"A book is a door. You open it. You step through."
宏观是我们必须接受的，微观才是我们能有所作为的。
国君得到了我的学说，就必然会采用。