购买旧书，它们的词与新词相同，也可以去图书馆。

凡是做学问，必须从各个方面都理解透彻，还要更进一步深入理解内在的道理。

On motivation: "I strongly believe that missionaries make better products. They care more. For a missionary， it's not just about the business. There has to be a business， and the business has to make sense， but that's not why you do it. You do it because you have something meaningful that motivates you."

世界可能很刻薄，但人们不必如此。