你不必总是比别人强，但要比过去的自己更强。
It's not always necessary to be better than everyone else, but to be better than you used to be.
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."