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preach to deaf ears
To present arguments to or attempt to persuade or advise those who have no inclination to change their opinion or belief. You're preaching to deaf ears if you think you can convince these kids to stay away from alcohol before they turn 21. Even though they know they're preaching to deaf ears, the hate group makes a point of holding protests outside churches and the funerals of slain soldiers.
preach to the choir
To try to convince someone about something that they already support or understand. You're preaching to the choir here—we all have kids and understand how busy life with kids is.
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.
Practice what you preach.
Prov. Cliché You yourself should do the things you advise other people to do. Dad always told us we should only watch an hour of television every day, but we all knew he didn't practice what he preached.
preach about something
to give a moral or stern discourse on something. Please don't preach about the evils of fried food. I like the stuff, and people eat it all the time and don't die! She was preaching about the value of a fat-free diet.
preach against someone or something
to exhort against someone or something. The evangelist preached against the operator of the town's only saloon. The principal kept preaching against drinking and drugs.
preach at someone
to lecture or moralize at someone. Don't preach at me! I don't need any of your moralizing. I really don't wish to be preached at.
preach to someone
to give a moral discourse to someone. Please don't preach to me. I know that I did wrong. When you preach to us like that, we don't pay any attention to you.
preach to the choirand preach to the converted
Fig. to make one's case primarily to one's supporters; to make one's case only to those people who are present or who are already friendly to the issues. There is no need to convince us of the value of hard work. We already know that. You are just preaching to the choir. Don't waste your time telling us about the problem. That's preaching to the choir. Bob found himself preaching to the converted when he was telling Jane the advantages of living in the suburbs. She already hates city life.
practice what you preach
Behave as you would have others behave, as in You keep telling us to clean up, but I wish you'd practice what you preach. This idiom expresses an ancient idea but appeared in this precise form only in 1678. Also see do as I say.
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]
be preaching to the converted
If someone is preaching to the converted, they are presenting an opinion or argument to people who already agree with them. You're wasting your time preaching to the converted. In any case the film was, by and large, preaching to the converted. Note: The converted are people who have converted, or changed their religious beliefs. Preaching is the activity of telling people about a religion.
practise what you preach
COMMON If you practise what you preach, you behave in the way that you encourage other people to behave. Note: The verb `practise' is spelled `practice' in American English. He practised what he preached, being more interested in moral values than money. I ought to be showing leadership and practise what I am preaching. Note: People sometimes vary this expression. The Bishop said the government had let the people down badly: it had preached love but practised hate.
preach to thechoir/converted
To argue in favor of a viewpoint already held by one's audience.