1605 The Lord himself shows that this signifies an unbreakable union of their two lives by recalling what the plan of the Creator had been “in the beginning”: “So they are no longer two, but one flesh.”
1614 In his preaching Jesus unequivocally taught the original meaning of the union of man and woman as the Creator willed it from the beginning permission given by Moses to divorce one’s wife was a concession to the hardness of hearts. The matrimonial union of man and woman is indissoluble: God himself has determined it “what therefore God has joined together, let no man put asunder.”
1615 This unequivocal insistence on the indissolubility of the marriage bond may have left some perplexed
1629 the Church, after an examination of the situation by the competent ecclesiastical tribunal, can declare the nullity of a marriage, i.e., that the marriage never existed.
1638 “From a valid marriage arises a bond between the spouses which by its very nature is perpetual and exclusive; furthermore, in a Christian marriage the spouses are strengthened and, as it were, consecrated for the duties and the dignity of their state by a special sacrament.”
1640 Thus the marriage bond has been established by God himself in such a way that a marriage concluded and consummated between baptized persons can never be dissolved. This bond, which results from the free human act of the spouses and their consummation of the marriage, is a reality, henceforth irrevocable, and gives rise to a covenant guaranteed by God’s fidelity. The Church does not have the power to contravene this disposition of divine wisdom.
1644 The love of the spouses requires, of its very nature, the unity and indissolubility of the spouses’ community of persons, which embraces their entire life: “so they are no longer two, but one flesh.”
1650 Today there are numerous Catholics in many countries who have recourse to civil divorce and contract new civil unions. In fidelity to the words of Jesus Christ - "Whoever divorces his wife and marries another, commits adultery against her; and if she divorces her husband and marries another, she commits adultery"the Church maintains that a new union cannot be recognized as valid, if the first marriage was.
1665 The remarriage of persons divorced from a living, lawful spouse contravenes the plan and law of God as taught by Christ.