Fifth, the Gospel must enable couples to realize that each person is not perfect, as their forgiveness in Christ propels them to forgive each other (Eph. 4:32; Col 3:13). Grudges must never be held. There must be a continual focus on how much we have been forgiven in Christ and in turn must reciprocate to the other person.
As one looks towards marriage, each person needs to early on learn to forgive the other (as much as the other person repents), because a life long covenant will rapidly decay from the inside if the forgiveness of Christ is not centrally practiced.