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.
John Newton and God’s Amazing Grace
Scipione Lentolo – A Firm Hand in Unstable Times
Henry ‘Ōpūkaha‘ia and the Birth of Christian Missions in the Hawaiian Islands
A Troubled Childhood
Philip Ryken shares why this year's Philadelphia Conference on Reformed Theology should not be missed!
"What is it about Calvin that so inspires me? This: his disciplined style, his determination never to speculate, his utter submission to Bible words as God's words, his submission to Christ's Lordship, his sense of the holy, his concern to be as practical as possible; the fact that godly living was his aim and not theology for the sake of it. In a forest of theologians, Calvin stands like a Californian Redwood, towering over everyone else." — Derek Thomas