See also chapter 16 Quaker marriage procedure
Marriage, says the Christian, is for life; and the wedding is a declaration that it is so. It is a fearsome declaration to make, and without the grace of God, arrogant and absurd...
This is why the wedding is an act of worship, and not merely a formal indication in a register office: because the Christian, saying these terrible things, dare not just nod them off before a clerk; but must come and put his vows into the hand of God, trusting that God will hold [the couple] where He wants them held. To turn a wedding into worship is to recognise that marriage is bigger than we are; that it is not just a pleasant arrangement we have made for our own convenience, but a vocation into which we have been drawn by nature and by God.
The truth is that very few marriages remain all the time, day and night, summer and winter, pleasant or convenient. We have to give things up for each other: sometimes hobbies and pastimes, habits of spending, friends. Some glib talkers about marriage say that we do not need to 'give up': we must enrich each other's lives, not rob them. But this is unreal... If we mean business about marriage, we shall throw a good deal overboard in painful but decisive abandon; we shall bring along with us whatever is shareable, and a few things that are not; and we shall discover new things that we never did alone, but which we can start together and use as the basis for 'mutual society, help and comfort, in prosperity and adversity'... Then the Christian knows he is committed, that he is in it for good or ill; and in a curious way the situation is lightened by the knowledge.
Harold Loukes, 1962