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.
Ronald KnoxRelated topics
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Pure community is a matter of no interest to any will; but a community which pursues a common good is of supreme interest to all wills; and what we have here said is that whatever the nature of that common good ... it must contain the development of individual powers, as a prior condition for all other goods.
William Ernest Hocking