REMARRIAGE
A woman is bound to her husband as long as he lives. But if her husband dies, she is free to marry anyone she wishes, but he must belong to the Lord.
The Bible, 1 Corinthians 7:39
The primary question is how it [the church] may find some arrangement that will give adequate form both to its beliefs about the permanence of marriage and to its beliefs about the forgiveness of the penitent sinner.
Professor Oliver O’Donovan, Regius Professor of Moral and Pastoral Theology at Oxford