科学是一股向善的力量，但前提是我们明智地使用它。

The work of every workman is fully planned out by the management at least one day in advance, and each man receives in most cases complete written instructions, describing in detail the task which he is to accomplish.

真正的天堂是我们已经失去的天堂。

"We are all the sum of our memories, and yet we remember so little."

释义：看见一片落叶，就知道一年内的时间将要到头了。通过细微的迹象，可以预料到整个形势的发展趋向与结果。