幸福取决于内心，而非外界。

在采石行业的成功不仅仅是开采石头；它关乎理解土地并尊重其极限。

科学家最重要的品质是坚持。

Every man is his own God. If you give up yourself, who else will save you? A strong man can save.

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:

我总是努力提升自己。