教育是使人变得有道德的艺术。

The merit of Marx is that he suddenly produces a qualitative change in the history of social thought. He interprets history, understands its dynamic, predicts the future, but in addition to predicting it, he expresses a revolutionary concept: the world must not only be interpreted, it must be transformed.

译文： 深敛沉着、敦厚持重是第一等资质，光明磊落、豪迈雄健是第二等资质，聪明机智、多才明辨是第三等资质。

数学的美在于它能够以最抽象的术语描述宇宙。