From
《论语·泰伯》:
三分天下有其二,
以服事殷,
周之德,
其可谓至德也已矣。(Holding two-thirds of the realm yet still serving the Yin - the virtue of Zhou may truly be called the highest virtue.) Confucius praises King Wen (
周文王) for restraint: though powerful enough to topple the Shang, he refused to rebel against his nominal overlord.