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"It is through conscience that human beings see and recognize the demands of the divine law. They are bound to follow their conscience faithfully in everything they do."
VATICAN II
Religious Liberty, no 2.


Pope Gregory IX on Contraception

Decretals - 1234 AD

 

Fr Columba Ryan OPIf anyone, to satisfy his lust or in meditated hatred, does something to a man or woman or gives them something to drink so that he cannot generate or she conceive, or the offspring be born—let him be considered a murderer (Decretals, Book V, 12, 5).

If conditions are set against the substance of marriage—for example, if one says to the other, “I contract with you if you avoid offspring” – the matrimonial contract, in spite of mutual consent, lacks effect (Decretals, Book IV, 5, 7).