建模的艺术在于忽略正确的东西。
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night, so don't give up today.
虽然熟读了《诗经》三百篇,但让他去处理政事,却办不好;派他出使国外,却不能独立地根据具体情况应对自如;这样的人,读的即使再多,又有什么用处呢?