preach to the converted

(also preach to the choir)

Definition

› to try to persuade people to believe things that they already believe: You needn't bother telling us how recycling helps the environment, because you're preaching to the converted.Urging and persuadingCausing somebody to act

(Definition of preach to the converted from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Browse related topics

You are looking at an entry to do with Urging & persuading, but you might be interested in these topics from the Expressing agreement & support topic area: