I Do? by David Blankenhorn
Blankenhorn argues against couples writing their own vows because this leads the couple to assume that they are creating the institution of marriage tailored to meet their needs and feelings.  Their personalized vows convey that marriage is "a loving relationship of undetermined duration created of the couple, by the couple, and for the couple.  The couple should be helped to understand that they are entering an institution ordained by God, not one that they personally craft.  Mar/Apr 2004 Theology Matters, p. 12