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general::
Phrase(s): Eavesdroppers never hear any good of themselves. [and] Listeners never hear any good of themselves.
Prov. If you eavesdrop on people who are talking about you, chances are that you will hear them say unfavorable things about you. (This implies that you should not eavesdrop.) • Child: Mommy, I heard Suzy and Lisa talking about me, and they said I was a crybaby! Mother: That just goes to show you, dear, that eavesdroppers never hear any good of themselves. • I knew that Mother and Dad had gone into the other room to discuss my situation, and I was tempted to put my ear to the door and listen to them, but I remembered that listeners never hear any good of themselves.
McGrawhill's American Idioms And Phrasal Verbs