《孔子家语·屈节解》
你如果不知道这件事还可原谅，单父老人告诉你而你却不听，这不是为民着想。 
不知犹可，以告者而子不听，非所以为民也。 
If you didn’t know about this, I could forgive you. But the old man of Shanfu told you about it, yet you still did nothing. That shows you don't care about the people.