The value of an economic model lies in its ability to explain and predict.
勇氣是所有美德中最重要的，因?yàn)闆]有勇氣，你就無法始終如一地實(shí)踐其他美德。
The only way to do great work is to love what you do.
The stones we pull from the earth carry 400 million years of history—we're merely temporary stewards.