Preaching to the choir
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Preaching to the choir means you are trying to make believers out of people who already believe, or convince people who are already convinced.
Preaching to the choir meaning & definition 1 of Preaching to the choir.
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Extolling/defaming a cause to people convinced of its greatness/horridness. Etymology is obviously from [christian] church choirs.
Preaching to the choir meaning & definition 2 of Preaching to the choir.