Discipline of the Secret

A modern term describing a practise of the ancient Church, by which knowledge of the more intimate mysteries of the Christian religion, such as the Trinity and the doctrine of some of the Sacraments, were kept from the heathen and, at least in the earlier stages of their instruction, from catechumens. It was a custom intended to shield the doctrines and mysteries of Christianity from ridicule or misconception.

New Catholic Dictionary

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