In From Beginning to End: The Rituals of our Lives, Fulghum has this to say on the ritual of marriage. The last lines are a magical segue into your vows.
You have known each other from the first glance of acquaintance to this point of commitment. At some point, you decided to marry. From that moment of yes to this moment of yes, indeed, you have been making promises and agreements in an informal way. All those conversations that were held riding in a car or over a meal or during long walks — all those sentences that began with “When we’re married” and continued with “I will and you will and we will” — those late night talks that included “someday” and “somehow” and “maybe” — and all those promises that are unspoken matters of the heart. All these common things, and more, are the real process of a wedding.
The symbolic vows that you are about to make are a way of saying to one another, “You know all those things we’ve promised and hoped and dreamed — well I meant it all, every word.” Look at one another and remember this moment in time. Before this moment you have been many things to one another — acquaintance, friend, companion, lover, dancing partner, and even teacher, for you have learned much from one another in these last few years.
Now you shall say a few words that take you across a threshold of life, and things will never quite be the same between you two. For after these vows, you shall say to the world, “this is my husband,” “this is my wife.”