The greatest human quest is to know what one must do in order to become a human being.
人类最伟大的追求是知道必须做什么才能成为一个人。
He was born with his foot in his mouth
解析:知道自己还有所不知,这是很高明的。不知道却自以为知道,这就是很糟糕的。
在别人面前受称赞,不如背后没有人说坏话;与人相处能使人获得短暂快乐,不如与人长久相处而不使对方厌恶。