"In the silence of the night, words find their way to the soul."
We have a responsibility to future generations to leave the planet in better shape than we found it.
我们有责任为子孙后代留下一个比我们发现时更好的地球。
当课堂只追求“有趣”，知识就失去了厚度。
Optimism is a strategy for making a better future. Because unless you believe that the future can be better, you are unlikely to step up and take responsibility for making it so.
Every man's own satisfaction is the centre of all that he looks at.