It doesn't do to say that heresy produces the development of doctrine, because that annoys the theologians. But it is true to say that as a matter of history the development of doctrine has been largely a reaction on the Church's part to the attacks of heresy.

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Quote text and notes from Wikiquote: Ronald Knox (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.