译文：做好事就像登山一样艰难，做坏事就像山崩一样容易。

A legal system is a system of rules which are valid according to the system's own criteria of validity.

I don't need a reason to be unstoppable.

经济历史的研究不仅仅是关于过去；它是关于理解当前不平等的根源。

白天从妻子儿女的反应来省察自己的行为以看其是否诚信；夜晚由梦境情况来考验自己的志气，以知道其是否坚定。

The best decisions are made when you listen to both data and people.

You have to be willing to fail in order to succeed.