Mt 19:1-9
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Summary: Christ asserted to the Apostles who would spread Catholic marriage and also to the Pharisees looking for loopholes on re-marriage, that in certain circumstances a married person could carefully discern departure from one’s spouse when the other was provably guilty of unfaithfulness, and the early Church added physical and psychological safety or salvation to this, then, you may discern departure from your spouse, but you still can’t re-marry.