preach

practise what you preach (British & Australian, American)

to do what you advise other people to do. I would have more respect for him if he practised what he preaches.

preach to the converted

to try to persuade people to believe things they already believe. There's no need to tell us about the benefits of recycling. You're preaching to the converted. (usually in continuous tenses)

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practice what you preach

to behave the way you tell other people to behave. Other countries need to see that we practice what we preach when it comes to human rights. I practice what I preach in that I exercise almost every day.

See also: practice

preach to the choir

to talk about something with a group of people who already agree with you. I realized that all I was doing was preaching to the choir — the men who really need to hear about this don't come to these groups.

preach to the converted

to talk about something with a group of people who already agree with you. Many websites seem to only preach to the converted, but others attract all sorts of people.