【译文】学问来源于思考。

The history of all hitherto existing society is the history of class struggles.

History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation.

历史不会长期将自由的维护托付给软弱或胆怯的人。

教育的真正价值不仅在于事实的积累，而在于训练思维进行批判性和创造性的思考。