记忆是个狡猾的东西；它既可以是安慰，也可以是诅咒。
Memory is a tricky thing; it can be both a comfort and a curse.
艺术中没有错误，只有意外的发现。
The most important single aspect of software development is to be clear about what you are trying to build.
发现的喜悦是推动数学家前进的动力。