Calvin has already established his understanding of "a twofold government" to which human beings are subject: an inward government in which God rules over the individual human soul for eternal life and an outward government in which God through human government establishes civil justice and outward morality (4.20.1).
Marriage has been instituted by God, but it is not a sacrament. Many are the good things which God has instituted, but that does not make them sacraments, which are, by definition, signs and ceremonies to confirm God's promise to us. The fact that marriage illustrates Christ's relationship to the church does not make it a sacrament either - many are the things that illustrate it, but they are not sacraments.
The Meaning of Christ’s Ascension
Olaudah Equiano – Waking Up Christians to the Evils of Slavery
John Chrysostom and Olympias – Finding Comfort in Troubled Times
One summer, a family man (and personal friend) traveled to Paris, where he spent a morning enjoying Luxembourg Gardens. In time, he noticed a group of mothers who, he realized, were so engrossed in their conversation that they tilted toward neglect of their children. He watched as one child wandered ever farther from her mother in the crowded park. Not yet two, she began to follow a family, apparently thinking its mother was her mother. When the group crossed a street and hurried onward, the child was finally quite alone.
In recent years, it seems increasingly rare to hear believers say, “I grew up in a happy home and we had everything we needed.” I almost never hear anyone say “I am making progress as a disciple,” although healthy believers should keep growing (below). The unfettered gratitude we hear in Psalm 16:6 has gone missing: “The lines have fallen for me in pleasant places; indeed I have a beautiful inheritance.” It has become difficult, even fraught, to say “My life is good,” in public at least.
(Rev. 1:17, 18)
Walking with God