Paging Celia - writing vows

We are writing our own vows this week. I remember Celia saying something like "2 lines this, 2 lines that, 2 lines this, and done" but I cannot remember what her formula was nor can I find it. Anyone have a general structure we can use to keep our vows short and somewhat consistent to one another's? We aren't planning on sharing them with one another ahead of time. Thanks!!!