在那样的年纪，我会找任何借口做些估测或者小算术。我会计算油耗还有杂货花销等鸡毛蒜皮的小事。我听过一个有关吸烟的广告。我记不得细节了，但是广告大意是说，每吸一口香烟会减少几分钟的寿命，大概是两分钟。无论如何，我决定为祖母做个算术。我估测了祖母每天要吸几支香烟，每支香烟要吸几口等等，然后心满意足地得出了一个合理的数字。接着，我捅了捅坐在前面的祖母的头，又拍了拍她的肩膀，然后骄傲地宣称，"每天吸两分钟的烟，你就少活九年！"
The principle of asceticism never was， nor ever can be， consistently pursued by any living creature.
禁欲主义原则从来没有被任何生物一贯坚持过，也永远不会被如此坚持。
我们生产的每一片药都承载着一个承诺——治愈、希望、改善生活。
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.
有时候最真实的东西反而是你看不见的。
Scientific research should solve practical problems, not just stay on papers.
数学的美在于它能够用一种超越文化和语言障碍的语言来描述宇宙。