206 But this commandment is aimed directly at the state of marriage and gives us an opportunity to speak about it. First, understand and mark well how gloriously God honors and praises this estate. For by His commandment He both approves and guards it. He has approved it above in the Fourth Commandment, 「Honor your father and your mother.」 But here He has (as we said) hedged it about and protected it. 207 Therefore, He also wishes us to honor it [Hebrews 13:4] and to maintain and govern it as a divine and blessed estate because, in the first place, He has instituted it before all others. He created man and woman separately, as is clear [Genesis 1:27]. This was not for lewdness, but so that they might live together in marriage, be fruitful, bear children, and nourish and train them to honor God [Genesis 1:28; Psalm 128; Proverbs 22:6; Ephesians 6:4].
208 Therefore, God has also most richly blessed this estate above all others. In addition, He has bestowed on it and wrapped up in it everything in the world, so that this estate might be well and richly provided for. Married life is, therefore, no joke or presumption. It is an excellent thing and a matter of divine seriousness. For marriage has the highest importance to God so that people are raised up who may serve the world and promote the knowledge of God, godly living, and all virtues, to fight against wickedness and the devil.
——Martin Luther (Book of Concord, Large Catechism, Sixth Commandment)