《史记·三十世家·晋世家》
不如私下里答应恢复曹国、卫国以便引诱楚国，扣留宛春来激怒楚国，视战争胜负的情况再来计谋。 
不如私许曹、卫以诱之，执宛春以怒楚，既战而后图之。 
It would be better to make a private deal to restore the States of Cao and Wei to bait Chu. Detain Wanchun to irritate Chu and see the results of the battle before making further plans.