随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。
Randomized evaluations can help us understand what works and what doesn't in development.
学习新编程语言的唯一方法就是用它编写程序。
"Doubt is useful for a while. We must all pass through the garden of Gethsemane. If Christ played with doubt, so must we."
英雄是懂得责任与自由同在的人。