Invert, always invert: Turn a situation or problem upside down. Look at it backward.

在数学中，解决问题的旅程与解决方案本身同样重要。

"The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them."

民族主义第六讲

边界？我从未见过。但我听说它们存在于某些人的脑海中。

In the end, we will remember not the words of our enemies, but the silence of our friends.

学习之道，没有什么比能够弄清事物的始末，来龙去脉更重要的。