The pope and his cardinals, monks, nuns, and priests have tried to improve things and ordain a holy estate in which they might live in holiness and chastity. But how holy, pure, and chaste the lives of popes, cardinals, bishops, monks, priests, and nuns have been is so apparent that the sun, moon, and stars have cried out against it. Pigsties are nasty, dirty places, but they are clean and pure compared with the cloisters; for they have been leading such a chaste and pure life in the cloisters that one cannot very well even speak of it. Why, then, did this happen? Because they tore down and despised God’s holy ordinance of the estate of matrimony and they were not worthy to enter into marriage. But here those who have entered into holy matrimony in accord with God’s ordinance should love and esteem this saying of St. Paul:
“Let marriage be held in honor among all, and let the marriage bed be undefiled, etc
They should also pride themselves upon and comfort themselves with the fact that they are married; for here a man can say: I thank God that I have been created a man by God; or a woman: I thank God that I have been created a woman; and that we have also been placed by God in the holy estate of marriage in order to bring forth children according to his blessing and will. This honor, which those who are married have, is far greater. Therefore, nobody should hate or condemn this estate and ordinance of God, as the pope and his followers do, but rather highly exalt it and love and esteem it. (“Sermon at Marriage of Sigismund von Luindenau, 1545” (Luther’s Works, v. 51, p.359-360)