preach to the converted

Idioms  

1. Try to convince someone who is already convinced, as in Why tell me smoking is bad when I gave it up years ago? You're preaching to the converted. [Mid-1800s]

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Example Sentences

“If you want to make a difference, you can’t just preach to the converted,” says Goode.

From Los Angeles Times

It doesn’t preach to the converted.

From Los Angeles Times

John Ashbery believed that readers of poetry are “already disposed” to be active politically and “to exhort them to do that in a poem is to preach to the converted.”

From New York Times

Do you think your film will change minds, rather than just preach to the converted?

From Salon

"But we set out to make a film for everybody, not to preach to the converted but document this amazing event."

From Los Angeles Times