You shall not commit adultery. What does this mean? We should fear and love God so that we lead a sexually pure and decent life in what we say and do, and husband and wife love and honor each other. (Small Catechism: The Sixth Commandment)
He is risen indeed! Alleluia! In the Name + of Jesus. Amen. Marriage is a gift from God. He created marriage when He fashioned woman from the rib that He took from Adam's side. She was created especially for Adam, and Adam was truly the only man for her.
The Lord's giving of husband to wife and wife to husband in marriage is all a wonderful picture. When the Lord creates art, He doesn't create a painting on a wall, or some lifeless statues. No, He makes living and breathing art: man and woman, in lifelong union, as a living picture of Christ and His Bride, the Church.
To the world marriage is just a contract that can be canceled whenever. It's a relationship that can be redefined to include whichever two or more individuals it wanted. Marriage can be ignored all together. The intimacy designed only for marriage can be stolen for a one-night thrill, or cheaply peddled on street corners and websites.
Our sinful nature wants to corrupt this gift in every way. The devil wants our lust to get the better of us, and he wants husbands and wives to not love and honor each other. And if things aren't going right, well, the world says, "Just end it," instead of receiving Jesus' forgiveness which heals all wounds.
All our sins against the Sixth Commandment, along with all our others sins against the other nine commandments, are the sins of the world--our sins--that were taken away by the Lamb of God. He bled for them, died for them. He rose from the dead to free us from them and set us right with God who gives the gifts.
Marriage is a wonderful gift. The Lord Jesus created it for an intimacy that can only be found there: "It is not good that man should be alone" (Genesis 2). We cherish marriage as Jesus gave it, for He gave it as a picture of Himself and His Church where we are washed, absolved, and fed until the marriage feast of the Lamb in His kingdom, which has no end. He is risen indeed! Alleluia! In the Name + of Jesus. Amen.
The world against me rages, Its fury I disdain; Though bitter war it wages, Its work is all in vain. My heart from care is free, No trouble troubles me. Misfortune now is play, And night is bright as day. (Awake, My Heart, with Gladness, LSB 467:5)