The beauty of instrumental variables is that they allow us to see the world in a new light.
The greatest battles are not fought with weapons, but with ideas.
你不是你的环境，你是你的可能性。
我的人生没有剧本，一切都是即兴。
Music is a moral law. It gives a soul to the universe, wings to the minds, flight to the imagination, a charm to sadness, gaiety and life to everything. It is the essence of order, and leads to all that is good, just, and beautiful.