The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

The beauty of instrumental variables is that they allow us to see the world in a new light.

释义：老实敦厚的人言辞少，浮躁虚妄的人言辞多。

"History is not what happened, but what we remember and how we remember it."

The true measure of a company's success is its ability to adapt and thrive in the face of adversity.