Loyalty in his single minded devotion to Liu Pei and righteousness because when Ts'ao Ts'ao fell into his hands he did not forget how Ts'ao Ts'ao had once treated him kindly as a prisoner and thus finally released him.
忠，在於他矢志效忠劉備，從無二心；義是因為赤壁之戰時，曹操潰敗，逃至華容道，落在埋伏等候的關公手中，但關公念及先前曹操俘虜他時的種種恩義，終究放走了曹操。