Jesus said it to men who had just called the work of God the work of Beelzebul. Your words are a window into your heart. They are not a wand that makes things happen.
Out of the abundance of the heart the mouth speaks means that what fills you on the inside eventually comes out in your words. Jesus said it in Matthew 12:34 and again in Luke 6:45.
Your words are evidence of your heart, not a force that creates your circumstances. Change the heart and the speech follows. Try to fix only the speech and you are stapling fruit onto a dead tree.
That matters, because many Christians have been taught the reverse. Jesus taught a direction of flow, and it runs from the inside out.
Most people meet this verse on a plaque. In Matthew it lands in the middle of a confrontation, and the confrontation is the key.
A man who could neither see nor speak is brought to Jesus, and Jesus heals him. The man talks and sees.
People ask out loud whether this could be the Son of David.
Rather than admit God is at work, they credit the healing to the prince of the enemy. We unpack that name in our study on Beelzebub.
A divided house cannot stand. Then the sober warning about speaking against the Holy Spirit, which we treat fully in what blasphemy against the Holy Spirit is.
Jesus traces their words back to their source. Here is where our verse lives.
“Either make the tree good and its fruit good, or make the tree bad and its fruit bad, for the tree is known by its fruit. You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.”
Matthew 12:33-34 ESVSo the first people this verse describes are the Pharisees, religious leaders who watched a man walk out of darkness and called it evil. Their sentence about Beelzebul was not a slip. It was fruit, a resentment so full it could look straight at mercy and call it evil.
The Greek word behind abundance carries the whole picture.
Thayer gives “abundance in which one delights” and, as a second sense, “what is left over, residue, remains” (Blue Letter Bible, G4051).
Matthew 12:34, Luke 6:45, Mark 8:8 for the leftover bread gathered after the feeding, and twice in 2 Corinthians 8:14 for a surplus shared with others.
What spills past the brim. Not what you decide to say on your best day, but what comes out once the heart is full of something.
Anybody can manage their words for a job interview. The mouth tells the truth when you are tired, cut off on the Long Island Expressway, or scrolling late at night. Whatever fills the heart finds the exit.
And the heart in Scripture is more than feelings. It is the center of a person, where thinking, desire and will meet (see the heart in the Bible).
Luke 6:45 has the same line in the Sermon on the Plain, right after the warning about the speck in your brother's eye and the log in your own (6:41-42), and right before “Why do you call me Lord, Lord, and not do what I tell you?” (6:46).
In Matthew the saying exposes opponents. In Luke it is aimed at disciples. Before you start diagnosing other people's hearts by their words, listen to your own.
Your words are the overflow of your heart. Matthew shows it in Jesus' enemies. Luke asks you to check it in yourself first.
Jesus follows the saying with a line that makes people nervous: people will give account for every careless word they speak, “for by your words you will be justified, and by your words you will be condemned.”
The King James says every idle word. The Greek is argos, built from a negative prefix and ergon, work. Thayer's range includes inactive, idle, and “unprofitable.” A word that was not doing any work. The throwaway line.
Planned speech can be performed. The unguarded remark is the honest one, which is exactly why Jesus names it. It shows the tree.
Words justify or condemn because they testify. They are the witness that tells what is in you, not a spell that settles your fate.
In this chapter Jesus calls His hearers an evil and adulterous generation (12:39) and says “so also will it be with this evil generation” (12:45). His warning had a first audience and a real reckoning in their own time.
The principle outlasts them. Speech is some of the most visible fruit a life produces.
This is not God keeping a transcript to trap you, and it is not salvation by good manners. Words are evidence about the heart, and a heart made new by Jesus produces different evidence.
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Manage My Giving"Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver."2 Corinthians 9:7
A popular strand of teaching turns this whole passage around. It says your words carry creative power, so you must speak healing, prosperity and success into existence and never make a negative confession, because saying “I think I'm getting sick” invites the sickness.
Take it at its strongest. God created by speaking in Genesis 1. We bear His image. Proverbs 18:21 says death and life are in the power of the tongue. Mark 11:23 speaks of saying to a mountain, be taken up. Put together, that sounds like a case.
The mouth shapes reality. Confess the outcome you want, refuse to name the problem, and your words will bring it about.
The heart shapes the mouth. Words reveal what is inside you. The flow runs from the heart outward, never from the mouth into the universe.
At Sound of Heaven we believe speak-it-into-existence teaching is wrong, and we say that as a Spirit-filled church that believes God heals today. Matthew 12:34 describes words as the overflow of the heart. Genesis 1 is God speaking, and being made in His image does not hand us His creative command. Proverbs 18:21 finishes with “those who love it will eat its fruits”, which is about living with the consequences of how you talk. And Mark 11 opens the mountain saying with “Have faith in God” (11:22). The faith is in God, not in the sentence.
Words are powerful in a real way. They wound and heal people, build or wreck marriages, and train our own hearts through repetition. Prayer and prophecy matter because God answers and speaks, not because the syllables carry a force of their own.
This lines up with what we said about Proverbs 23:7 in as a man thinketh in his heart. Thoughts shape character. They do not control outcomes. The same is true of words, and we look at that Proverbs verse on its own in life and death are in the power of the tongue.
This teaching lands hardest on the people who are already hurting. Someone with a diagnosis is told they confessed it. Parents wonder whether one worried sentence cost them a child. People stop telling anyone how they really feel.
Hear this clearly. Honest words about pain are not a curse. The Psalms are full of them, and Jesus Himself said “My soul is very sorrowful” in the garden. You are allowed to say it out loud, to God and to people who love you. If you need someone to pray with you, our prayer team is glad to.
In Matthew 12:34, which direction does Jesus say speech flows?
Out of the abundance of the heart the mouth speaks. The heart is the source and the mouth is the outlet. The verse is a diagnosis of the speaker, not a technique for changing events.
James, whom the church has long identified as the Lord's brother (see who wrote the book of James), spends a whole chapter on speech. He sounds like he learned it at Jesus' table.
“With it we bless our Lord and Father, and with it we curse people who are made in the likeness of God. From the same mouth come blessing and cursing. My brothers, these things ought not to be so. Does a spring pour forth from the same opening both fresh and salt water?”
James 3:9-11 ESVA spring and its source. A fig tree and its fruit (3:12). It is the tree and fruit logic of Matthew 12 all over again. James is not impressed by a Christian who sings on Sunday and tears people down on Monday, because the spring is telling on itself.
He is honest about how hard this is. “For we all stumble in many ways” (3:2). “No human being can tame the tongue” (3:8). The tongue will not be fixed from the outside, which pushes us back to the heart.
One error treats words like magic. The other treats them as if they barely count. You hear it as “I'm just being honest, that's what's on my heart,” used to excuse cruelty. Jesus did not say the overflow is fine because it is authentic. He said the overflow shows what needs to change.
Do not swing the other way and judge a whole heart by one bad sentence. Abundance means a pattern, what keeps spilling out when nobody is performing. For a related question, see is cursing a sin.
Jesus said make the tree good. You cannot glue apples onto a thornbush and call it an orchard. So the way forward is not a list of banned words. It is a heart that Jesus fills with something better.
For a week, notice what comes out when you are tired, rushed or hurt. Do not judge it yet. Just hear it. That is your heart talking.
Sarcasm is often hurt. Constant complaining is often fear. Harsh words about others are often shame about ourselves. Ask what the fruit is growing from.
Confess it plainly. The Jesus of the Gospels is patient with people who are honest about what is inside them.
Colossians 3:16 says to let the word of Christ dwell in you richly. What you fill up on is what spills. This is the heart of guarding your heart.
When you blow it, say so. An apology is fruit too. The Spirit grows self control over time, and every repaired conversation is evidence of a heart being made new.
Do not start with the tongue. Start with what the tongue is drawing from, and let Jesus change the source.
If the mouth reveals the heart, then the words of Jesus tell us exactly who He is. And His words are full of welcome. Come to me, all you who are weary. Your sins are forgiven. Neither do I condemn you. Father, forgive them.
That is what a heart full of the Father sounds like, and He shares that heart with us by His Spirit. The Kingdom is here, so the change starts now. Listen to your words with curiosity rather than dread. They will show you where you need Him.
For related reading, see the power of words in the Bible, what we believe as a church, and if you are near Deer Park, plan a visit and hear how this family talks about Jesus.
Jesus said it to men who called God's work evil: whatever fills the heart comes out of the mouth, so words are evidence of the heart rather than a power that creates reality, and the only lasting fix is a heart made new by Him.
If there is a pattern in your words you want changed, or words from someone else you are still carrying, tell us and somebody at Sound of Heaven will pray with you.
It means that what fills your heart eventually comes out in your words. Jesus said it in Matthew 12:34 to Pharisees who had just credited His healing of a blind and mute man to Beelzebul, and He repeats it in Luke 6:45. The Greek word for abundance describes overflow, what spills past the brim. Your words work like fruit on a tree. They show what is growing inside you. The verse is a diagnosis of the heart, not a technique for changing your circumstances.
Matthew 12:34 and Luke 6:45. In Matthew it comes right after the Beelzebul accusation and the warning about blasphemy against the Holy Spirit, followed by the saying about every careless word in verses 36 and 37. In Luke it sits in the Sermon on the Plain, after the teaching about the speck and the log and the good and bad trees. Matthew aims it at opponents, while Luke aims it at disciples examining themselves.
The Greek word is argos, formed from a negative prefix and the word for work, so it describes an idle word that was not doing any work. Jesus singles out the throwaway remark because it is the honest one. Planned speech can be performed, but the unguarded line shows the heart. Being justified or condemned by your words means your words serve as evidence of what is inside you. It does not mean God is keeping a transcript to trap you.
No. That teaching reverses what Jesus said. In Matthew 12:34 the flow runs from the heart out through the mouth, not from the mouth into your circumstances. In Genesis 1 it is God who speaks creation into being. Proverbs 18:21 is about living with the fruit of your speech, and Mark 11 begins with have faith in God. Words really do heal or wound people and shape our habits. They do not force outcomes, and an honest word about pain is never a curse.
Start with the heart, because that is where the words come from. Notice what spills out when you are tired or hurt, then ask what it is growing from, often fear, resentment or shame. Bring that root to Jesus honestly. Fill your heart with His words, as Colossians 3:16 says. When you get it wrong, apologize, because repair is fruit too. The Holy Spirit grows self control over time, and changed speech follows a changed heart.