“But the ungodly give consideration to the vituperations and the inconveniences of marriage and therefore shun it and fall into the works of the flesh: uncleanness, fornication, and adultery, of which Paul says in Gal. 5:21: “Those who do such things shall not inherit the kingdom of God.”
I am discussing these matters rather carefully and extensively because I see that the Holy Spirit did not disdain to describe His own work at such great length. Ungodly and wicked men, who suppose that everything happens by chance, understand nothing in the Holy Scriptures and the creatures of God. But it is our duty to read and to instruct others, in order that from Holy Scripture we may gain knowledge of the creatures, and from the creatures of the Creator.
Scripture points out that God’s creature has been blinded and marred. For this reason it praises the dignity of marriage at such great length. We are to learn, and to teach others that marriage is not to be held in slight esteem, as the flesh and the world are in the habit of doing. They do not consider what marriage is but take into account only concupiscence, lust, and sensual pleasure. They strive for ease and riches, which are original sin itself, by which our wretched nature is horribly contaminated. Therefore instead of the pleasure and enjoyment hoped for, they eventually find vexation, grief, and trouble” (Luther’s Works, v.4 p.248-249).