From
毛泽东《
七律·
人民解放军占领南京》 (Mao Zedong, April 1949, after PLA forces captured Nanjing):
宜将剩勇追穷寇,
不可沽名学霸王。
天若有情天亦老,
人间正道是沧桑 (Use remaining courage to chase the beaten enemy; do not seek empty fame like the Hegemon-King. If heaven had feeling, heaven too would age; the true path in this world is upheaval).
霸王 =
项羽 (Xiang Yu), who famously let Liu Bang escape at
鸿门宴 rather than kill an unarmed guest — losing the empire. Mao argues: do not repeat Xiang Yu's chivalrous mistake; press the KMT to total defeat.