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。