Disobedience, in the eyes of any one who has read history, is man's original virtue. It is through disobedience that progress has been made, through disobedience and through rebellion.

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.

老年人相信每一件事物；中年人猜疑每一件事物；青年人什么都懂。

有两种东西是无限的，宇宙和人类的愚蠢。

A workshop should smell of sawdust and dreams in equal measure.