抽象的目的不是含糊不清，而是创建一个新的语义层次，在这个层次上可以绝对精确。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
生活是一种人人须学而无人能教的艺术。
In modern life nothing produces such an effect as a good platitude. It makes the whole worldkin.
In a state, the liberty of one citizen is a menace to the others.
伟大不是一种技能，而是一种态度。