preach to the converted

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preach to the converted

To try to convince someone about something that they already support or understand. You're preaching to the converted here—we all have kids and understand how busy life with kids is.
See also: convert, preach

preach to the converted

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]
See also: convert, preach