在最低阶层中保存知识的手段对公众来说比国家中所有富人的所有财产都更重要。
The preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country.
All things are in a state of flux.
若以竞争者为中心，就得等到对手有所行动。以客户为中心，让你更具开拓性。
The truth is rarely pure and never simple.
没有一个明智的飞行员会忘记使用他的清单，无论他的才能和经验有多么出色。