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 natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.
Memory is not just a personal thing; it is also a collective thing.
质量从来不是偶然的，它始终是智慧努力的结果。
我一生中最遗憾的是善良的失败。