The next sentence in "The Way of Couples" is that if there is righteousness, there will be harmony, and if there is no righteousness, there will be separation.

The way of husband and wife, if there is righteousness, it will be harmonious, and if there is no righteousness, it will leave. "This sentence comes from Han Shu Kong Guang Ji written by Ban Gu in Han Dynasty. Tao: Guidance. Righteousness: Friendship. This sentence can be interpreted as: the principle between husband and wife is to be together with affection, and to be apart without affection.