Marriage is one of the noblest of human relationships. It is the very foundation of society. Allah has established a strong foundation for this relationship.
The verse tells us quite clearly that the marital relationship is to be established on a basis of mutual understanding, compassion, and love. Moreover, this relationship is a reciprocal one. It is not one-way. This relationship something that both the husband and wife must maintain together with closeness, affection, softness of heart, and mutual caring. This is the way that the “tranquility” mentioned in the verse is realized.