preach to the choir

The phrase "preach to the choir" refers to the act of expressing an opinion, information, or idea to people who already agree with or support it wholeheartedly. In other words, it is directing one's remarks or arguments to an audience that is already convinced or in alignment with the speaker's perspective. The phrase suggests that the communication may be unnecessary or redundant since the message is being delivered to those who are already on the same page.