The oldest Christian literature shows with great evidence that the first controversies among Christians were always decided by texts of the Old Testa… - Honoré-Joseph Coppieters

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The oldest Christian literature shows with great evidence that the first controversies among Christians were always decided by texts of the Old Testament, sayings of Our Lord, and the authority of the Apostles. This last ground was very important in the case of new questions on which there existed no explicit teaching of Christ. Therefore, it is easy to understand that the Apostolic Churches could not be lost sight of in such controversies.