君子重视自身的努力，而不羡慕上天的恩赐；小人放弃自身的努力，而羡慕上天的恩赐。
Profit is not the legitimate purpose of business. The legitimate purpose of business is to provide a product or service that people need and do it so well that it's profitable.
这个世界的问题在于愚者和狂徒对自己如此确信，而智者却充满疑虑。
Bread is the simplest form of food, yet it holds the most complexity.
学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。