《礼记·大学》
自己藏有不合 己所不欲，勿施于人 这一恕道的行为，却能使他人明白恕道，这是不会有的事情。
所藏乎身不恕，而能喻诸人者，未之有也。
Don't do what you don't want others to do to you. However, it is impossible to make others understand the Tao of forgiveness by hiding their own disapproving behavior.