Never stop learning—the moment you think you know everything is the moment you start falling behind.
永远不要停止学习——当你认为自己什么都懂的那一刻，就是你开始落后的时刻。
人心是一个谜，甚至对它自己也是如此。
History has neither the desire nor the capacity to make men better or worse; it merely records what they have been and what they have done.
今天我们种下的每棵树都是对未来清洁空气和健康生态系统的投资。