The true monument is not the building, but the memory it leaves behind.

同一元素的原子在质量和性质上是相同的。

"The world is a very puzzling place, and it is a great privilege to be able to think about it."

The habit of committing far more time to learning and thinking than to doing is no accident.

You can say so much with pictures that you don't need to say in words.

真正的监狱不是由围墙构成，而是由沉默的舌头和被审查的思想构成。