AI OVERVIEW: Jesus sharpens the teaching on divorce by returning to creation’s design: marriage is a one-flesh, lifelong covenant established by God that should not be separated. The Sermon on the Mount says divorce is allowed only for sexual immorality, and remarriage after such a divorce would be adultery for both the person who divorces and the one who remarries; this exception arises from hardness of heart and aims at reconciliation when possible. Beyond that, the teaching acknowledges gray areas such as abandonment, abuse, or destructive behavior, where separation and biblical divorce may be permitted after reconciliation, with counsel and accountability to God. The goal remains restoration and a marriage that honors God by two people truly following Jesus.