Christ taught that the sacramental bond of marriage is permanent and lasting: So they are no longer two, but one flesh. What therefore God has joined together, let no man separate (Matthew 19:6) The annulment process helps to determine whether or not a sacramental bond actually took place on the day of the wedding. If one did, than another marriage would actually be a second marriage while the first one was still intact and this would be morally wrong. You can find an indepth discussion of this issue in Divorced. Catholic. Now What?