This is yet another major cause of divorce. No sin is too great to be pardoned. When one partner has vowed in his or her heart never to pardon the other for an error made, an offence committed, or an injustice committed, they are unable to continue living happily together. Unforgiveness generates grief and resentment, which develops wickedness and hatred. This is the explanation for why partners are murdered in their sleep by their spouses. Without forgiveness, nothing and no one can endure in any marriage.