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.
马克思的功绩在于他忽然在社会思想史上产生了一个质的变化。他解释历史，理解其动力，预测未来，但除了预测之外，他还表达了一个革命性的概念：世界不仅必须被解释，还必须被改变。
制革厂的废水是其价值观最真实的衡量标准。
数学之美在于它能够将复杂的事物简化。
The time which we have at our disposal every day is elastic; the passions that we feel expand it, those that we inspire contract it.
译文：贪图蝇头小利之人是不能立下大功绩的，心存私欲的人是不能去为众人办实事的。赏析：蝇头小利会让人迷失心智，会让人丧失斗志，从而远离人生的大目标。心存私欲，自然就缺乏公平公正，有私心，说话做事自然就会心虚，内心不坚定，何以办大事。