挑战不仅仅是给人们钱，而是要理解他们在约束下如何做决策。
The challenge is not just to give people money but to understand how they make decisions under constraints.
Every great advance in science has issued from a new audacity of imagination.
贞节：仅为健康或生育的目的进行房事。爱惜身体，不要损害自己或他人的安宁与名誉。