蒸汽的力量如今已被充分理解，剩下的只是改进实践。

In times of change, the learners inherit the earth, while the learned find themselves beautifully equipped to deal with a world that no longer exists.

我们不是从祖先那里继承地球；我们是从子孙那里借来的。

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.