Daily Luther: Live Like Guests on This Earth
Christians should treasure that eternal blessing which is theirs in the faith, despising this life so that they do not sink too deeply into it either with love and desire or suffering and boredom, but should rather behave like guests on earth, using everything for a short time because of need and not for pleasure. This would mean having a wife as though I did not have one, when in my heart I would rather remain unmarried but in order to avoid sin have found it necessary to have one. But he who seeks not necessity but also desire, he does not have a wife but is himself possessed by a wife. A Christian should hold to this principle also in all other things. He should only serve necessity and not be a slave to his lust and nurture his old Adam.
Martin Luther, Luther’s Works, Vol. 28: 1 Corinthians 7, 1 Corinthians 15, Lectures on 1 Timothy, ed. Jaroslav Jan Pelikan, Hilton C. Oswald and Helmut T. Lehmann, 1 Co 7:31 (Saint Louis: Concordia Publishing House, 1999).