真正的理解来自同理心。

有权势的天子，也未必尊贵；穷苦的平民，也未必低贱。贵贱的分别，在于行为的美恶。

性能的关键在于优雅，而不是大量的特殊情况。

"The truth is rarely pure and never simple."

The beauty of mathematics lies not only in its ability to describe the world but also in its power to reveal the hidden structures that govern it.

因果方法在于理解生成数据的机制。