Your example continues to illustrate my statement the Roman Catholic Tradition has, does and will change.
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I think the word you're thinking of is "doctrine," which is related to, but not exactly the same as, "Tradition."
Doctrine develops.
Development is a kind of change in which a thing unfolds its own, proper nature from within, like a zygote which develops into a teenager.
Corruption is a kind of change, in which the original entity is devoured by abnormal growth, like a zygote which develops into a hydatidiform mole.
One wants the former. Not the latter.