The past is a shadow that follows us, but it is up to us to decide whether it will darken our future.

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

解读：知晓道理容易，付诸实践却困难重重，很多人困于理论，缺乏行动力，知行脱节带来巨大的挫败感与自我怀疑，督促人行动起来。

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.