《史记·十二本纪·周本纪》
若真为大王考虑，那周为秦出力要善待;不为秦出力也要善待，这样，才能让周和秦疏远。
为王计者，周於秦因善之，不於秦亦言善之，以疏之於秦。
If you really think about your majesty, then Zhou should be treated kindly if he does something for Qin; he should also be treated kindly if he does not do something for Qin, so that Zhou and Qin can be separated.