《旧唐书·列传·卷八十三》
李晟因孤军与强敌对垒，怕两支敌军合力进攻，就用好话重礼，假装和李怀光拉关系，表面崇敬，暗地戒备。
晟以孤军独当强寇，恐为二贼之所亻并，乃卑词厚币，伪致诚于怀光，外示推崇，内为之备。
Because Li Sheng's single army faced a powerful enemy, he was afraid that the two enemy armies would join forces to attack him. So he used kind words and generous gifts, pretending to form a relationship with Li Huaiguang, showing respect on the surface while secretly preparing for battle.