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Because he has taught nothing specifically, and because these things are not necessary for salvation, and for the upbuilding of the church ought to be variously accomodated to the customs of each nation and age, it will be fitting (as the advantage of the church will require) to change and abrogate traditional practices and to establish new ones. Indeed, I admit that we ought not to change into innovation rashly, suddenly, for insufficient cause. But love will best judge what may hurt or edify; and if we let love be our guide, all will be safe.

Institutes, IV, 10, 30