In this dialogue, Jesus explains to the Pharisees why Moses allowed divorce under the law. The allowance was not because divorce was part of God's original design for marriage, but because of the hardness of human hearts. This term, 'hardness of heart,' implies a resistance to God's will and a tendency toward self-centeredness and sin. Jesus is pointing out that the law was a concession to human weakness, not an endorsement of divorce as a desirable outcome.
By highlighting this, Jesus is calling His followers to a higher standard, one that seeks to restore and uphold the sanctity of marriage as God intended from the beginning. He encourages a transformation of the heart, moving away from stubbornness and towards compassion, understanding, and commitment. This teaching underscores the importance of aligning our lives with God's original intentions, fostering relationships that reflect His love and faithfulness. It challenges believers to examine their own hearts and strive for relationships that honor God and reflect His kingdom values.