可持续性不仅仅是关于环境，它还关乎人。
Sustainability is not just about the environment, it's about people.
Pain is temporary. It may last a minute, or an hour, or a day, or a year, but eventually it will subside and something else will take its place. If I quit, however, it lasts forever.
经济学家必须贪婪地收集事实；但事实本身并不能说明什么。
关键在于保持谦逊和渴望。