The importance of the “oral” proclamation of the gospel is a cornerstone of Lutheran theology. You could make a rather cogent argument for Lutheranism as a “preaching” movement. Early Lutherans certainly understood preaching as itself sacramental, even in the Augustinian sense of that term, because sound is a “material” means by which the promises of God enter the ears of hearers.
Luther famously remarked, “The ears are the only organs of the Christian.”
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