A girl who is taken into the family, but not as the chief wife, must behave with special caution and reserve. She must not take it upon herself to supplant the mistress of the house, for that would mean disorder and lead to untenable relationships.
The same is true of all voluntary relationships between human beings. While legally regulated relationships based on personal inclination depend in the long run entirely on tactful reserve.
Affection as the essential principle of relatedness is of the greatest importance in all relationships in the world. For the union of heaven and earth is the origin of the whole of nature. Among human beings likewise, spontaneous affection is the all-inclusive principle of union.