宇宙是一个相当大的地方。如果只有我们，那似乎是对空间的极大浪费。

成功的真正标准是你对他人产生的积极影响。

钱财像粪土一样轻贱，仁义像千锭金银一样贵重。

"The essence of mathematics lies in its freedom."

Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics: