339. How does sin threaten marriage? Because of original sin, which caused a rupture in the God-given communion between man and woman, the union of marriage is very often threatened by discord and infidelity. However, God in his infinite mercy gives to man and woman the grace to bring the union of their lives into accord with the original divine plan.
Further reading: CCC 1606-1608340. What does the Old Testament teach about marriage?
God helped his people above all through the teaching of the Law and the Prophets to deepen progressively their understanding of the unity and indissolubility of marriage. The nuptial covenant of God with Israel prepared for and prefigured the new covenant established by Jesus Christ the Son of God, with his spouse, the Church.
Further reading: CCC 1609-1611