蒸汽的力量如今已被充分理解，剩下的只是改进实践。

我们今天种植的每一棵树都是为我们永远不会见到的后代留下的遗产。

When you are young, you think you will be happy when you are older. But then you get older and you realize you were happy when you were young.

永远不要把运动和行动混为一谈。

一个人真正需要的财富就那么一点点，其余的都是用来炫耀的。