To argue for something to people who already agree.
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To argue for something to people who already agree with you.
Preaching to the choir means the effort is wasted — not because the argument is wrong, but because the audience is.
It's often said gently, as a hint to go and convince someone else.
"Beat a Dead Horse"
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Keep pushing something already settled
"Talk to a Brick Wall"
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Argue with someone who won't listen
"Preach to the Choir"
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Convince people who already agree