Marriage in the Lord
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."
Source: Catechism of the Catholic Church (Vatican.va)