"The mere change of custom, even though it may be of advantage in some respects, unsettles men by reason of the novelty: therefore, if it brings no advantage, it does much harm by unprofitably disturbing the Church."

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Even as he would be guilty of falsehood who would, in the name of another person, proffer things that are not committed to him, so too does a man incur the guilt of falsehood who, on the part of the Church, gives worship to God contrary to the manner established by the Church or divine authority, and according to ecclesiastical custom.

— Thomas Aquinas