"Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen."
— Ephesians 4:29 (NIV)
Ephesians 4:29 is the "let no corrupt communication proceed out of your mouth" verse, Paul's rule for words that build people up instead of tearing them down. This page gives the verse, what the key words mean, where it sits in Ephesians 4, and a plain reading. For more on the theme, see Bible verses about encouragement, Bible verses about the tongue, and Bible verses about kindness.
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The verse
The King James reads: "Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers."
"Unwholesome" (KJV "corrupt") is sapros (G4550), rotten or worthless, a word Jesus used for bad fruit. "Talk" is logos (G3056), word or speech. "Building up" (KJV "edifying") is oikodome (G3619), a building or the act of building. "Needs" is chreia (G5532), and "benefit" (KJV "minister grace") uses charis (G5485), grace or favor.
Where it sits in Ephesians 4
Paul is describing the new life in Christ: "put off your old self" and "put on the new self, created to be like God in true righteousness and holiness" (Ephesians 4:22-24). Then he gets specific. "Each of you must put off falsehood and speak truthfully to your neighbor, for we are all members of one body" (Ephesians 4:25). "In your anger do not sin" (Ephesians 4:26).
Verse 29 is the rule for speech. Right after it, Paul writes, "And do not grieve the Holy Spirit of God" (Ephesians 4:30), "Get rid of all bitterness, rage and anger, brawling and slander" (Ephesians 4:31), and "Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you" (Ephesians 4:32).
What the verse is saying
Paul does not only say what to avoid. He gives a test for what to say: is it helpful, does it build the other person up, does it fit what they need right now, and will it do the listener good? Words are meant to carry grace to the person hearing them.
That makes the verse practical for a hard conversation, a family argument, or a comment online. It does not rule out honesty; verse 25 asks for truth. It asks that the truth be spoken in a way that builds, the same way Paul describes "speaking the truth in love" earlier in the chapter (Ephesians 4:15).
Questions people ask
What does Ephesians 4:29 say?
In the NIV it says, "Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen."
What does "corrupt communication" mean in Ephesians 4:29?
It is the KJV wording. The Greek word sapros means rotten or worthless, so it covers any speech that spoils or tears down, such as slander, crude talk, or cutting words.
What does it mean to build others up?
The word Paul uses means building, like putting up a house. Words that build others up strengthen and help them, and Paul says they should fit the other person's needs.
What comes after Ephesians 4:29?
Verse 30 says, "And do not grieve the Holy Spirit of God," and verse 32 says, "Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you."
What verses go with Ephesians 4:29?
1 Thessalonians 5:11 (encourage one another and build each other up), Hebrews 10:24-25 (spur one another on toward love), and Colossians 4:6 (let your conversation be always full of grace) are close companions.
