The most difficult thing is to be simple.

城市是最伟大的建筑作品。

The perfection of machinery is to produce the desired effect with the least possible friction and waste.

The most exciting breakthroughs often come from unexpected places.

不可能与可能之间的区别在于一个人的决心。

心灵是一个积极、动态的过程，而非被动的容器。