真理的概念在任何足够强大以包含算术的形式系统中都是不可定义的。

如果你没有失败，说明你不够努力。

"The best way to get over a broken heart is to write a book."

I like dogs. You always know what a dog is thinking. It has four moods. Happy, sad, cross and concentrating. Also, dogs are faithful and they do not tell lies because they cannot talk.