There was a well in the middle of Mrs Adeleke’s compound in Ibadan, and she guarded it like a treasury.
It was an old well, dug long before the town’s water pipes reached that part of the city, lined with concrete rings and covered with a heavy iron lid that her late husband had made at a welder’s shop in Mokola. Every evening, without fail, she closed the lid before she went to bed, so that no lizard, rat or wandering child would fall in during the night. She kept a single bucket for the well, a clean one tied to a long rope, and nobody was allowed to drop any other bucket into it. Every few weeks she would sweep away the leaves that blew in from the mango tree. Once a year she paid a man to climb down and clean the walls. When the neighbours wanted to dig a pit latrine, she walked the distance with them, step by step, to make sure it would be far enough from her water.
Her grandson Tobi spent his school holidays there as a boy, and he thought she was a little excessive. “Grandma, it is just a well,” he once said, when she scolded him for leaving the lid open.
She looked at him over her glasses. “It is not just a well. It is the water we drink.”
But the thing Tobi remembered most clearly, years later, was the dry season. Every year, around February, the public taps in the area would cough and fail, sometimes for weeks. And every year, the whole street came to Mrs Adeleke’s gate. Women with basins on their heads. Children with yellow jerrycans. Old men with buckets. She let them all in. She drew the water herself, or stood beside them while they drew it with her bucket, and she never charged anyone a kobo. One morning Tobi counted thirty-seven people in the queue.
Punchline“Grandma,” he asked her that evening, “why do you guard the well so much if you are going to give the water to everybody?”
She laughed. “Tobi, that is why I guard it. If the water is dirty, what will I give them?”
He did not think about that conversation for almost twenty years. Then, at thirty-four, after a painful betrayal by a business partner, he found himself sitting in church hearing a sermon on Proverbs 4:23, and he realised he had been guarding his heart in a way his grandmother never guarded her well. He had put the lid on and locked it. He had stopped letting anyone draw from it at all.
What does it actually mean to guard your heart? The verse is one of the most quoted in the book of Proverbs, and also one of the most misunderstood. Let us look at it carefully.
A father’s lesson for the whole person
Proverbs 4 is a chapter of family teaching. It opens with a father speaking to his children: “Hear, ye children, the instruction of a father, and attend to know understanding” (Proverbs 4:1). Then he tells them where he learned it himself: “For I was my father’s son, tender and only beloved in the sight of my mother. He taught me also, and said unto me, Let thine heart retain my words: keep my commandments, and live” (Proverbs 4:3-4). This is wisdom passed down through generations, from grandfather to father to son. It is the voice of someone who loves the person he is teaching.
Our verse sits inside a short, carefully shaped passage near the end of the chapter:
My son, attend to my words; incline thine ear unto my sayings. Let them not depart from thine eyes; keep them in the midst of thine heart. For they are life unto those that find them, and health to all their flesh. Keep thy heart with all diligence; for out of it are the issues of life. Put away from thee a froward mouth, and perverse lips put far from thee. Let thine eyes look right on, and let thine eyelids look straight before thee. Ponder the path of thy feet, and let all thy ways be established. Turn not to the right hand nor to the left: remove thy foot from evil.
Notice how the father moves through the body. He begins with the ear: “incline thine ear unto my sayings.” Then the eyes: “Let them not depart from thine eyes.” Then the heart: “keep them in the midst of thine heart.” Then the mouth and lips: “Put away from thee a froward mouth.” Then the eyes again: “Let thine eyes look right on.” Then the feet: “Ponder the path of thy feet... remove thy foot from evil.”
Ear, eyes, heart, mouth, eyes, feet. The father is describing a whole person living wisely. What goes in through the ear and eye reaches the heart. What is kept in the heart comes out through the mouth and directs the feet. And right in the centre, holding everything together, is verse 23: “Keep thy heart with all diligence; for out of it are the issues of life.”
That structure matters. In Proverbs, guarding the heart is connected to what we listen to, what we look at, what we say and where we walk. It is the central part of a life of wisdom, and it is surrounded by very practical concerns.
Notice also the motive. “For they are life unto those that find them, and health to all their flesh.” The father wants his son to live, and he says so. Wisdom in Proverbs is always presented as something good, something to be desired, a path that leads to flourishing. The instruction to guard the heart comes in that spirit.
What the Bible means by the heart
When modern people hear the word heart, they usually think of emotions: feelings of love, sadness or excitement. When someone says “guard your heart,” they often mean “be careful not to get emotionally hurt.” That is a much smaller idea than the one in Proverbs.
In the Hebrew Scriptures, the heart is the centre of the whole inner life. It is the place where a person thinks, remembers, desires, decides and feels. The heart understands (1 Kings 3:9, where Solomon asks for “an understanding heart”). The heart plans (Proverbs 16:9). The heart can be wise or foolish, hard or soft, upright or crooked. When Mary heard what the shepherds said about her newborn son, she “kept all these things, and pondered them in her heart” (Luke 2:19). That is thinking and treasuring at the same time.
So when Proverbs speaks of the heart, it means the inward life from which choices arise. Your convictions live there. Your desires live there. Your loyalties, fears, hopes and memories live there. And all of it eventually shows itself in what you do.
Now look closely at the verse itself. “Keep thy heart” uses a word that means to watch over, to guard, the way a watchman guards a city or a keeper guards a vineyard. “With all diligence” is literally “above all keeping,” and the King James translators noted that literal sense in their margin. The idea is that of all the things you guard in life, your money, your property, your reputation, your family, the heart deserves the most careful watch of all.
Then comes the reason: “for out of it are the issues of life.” The word issues means outgoings, the places from which something flows out. The same Hebrew word is used in the book of Joshua for the boundaries of the tribal lands, where “the goings out” of a border reached the sea (Joshua 15:4). It describes the point where something extends and flows outward. The heart is the source from which the streams of a life flow out, and it also sets the boundaries within which a life is lived.
That is Mrs Adeleke’s well. Everything that came out of the compound, the water for drinking, cooking, washing and sharing, flowed from that one source. If the source was clean, the household was healthy and the street could be served. If the source was contaminated, everything that came from it would carry the contamination. She guarded the well because the well was the source.
NuggetGuard your heart the way a wise woman guards her well: because it is the source of everything that flows out of your life, and because others will drink from it.
The danger Jesus located
If the heart is the source, what is it that defiles a person? Jesus answered that question in a confrontation that every believer who wants to guard their heart should study:
And he said, That which cometh out of the man, that defileth the man. For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: All these evil things come from within, and defile the man.
The context is essential. The Pharisees and scribes from Jerusalem had noticed that Jesus’ disciples ate “with defiled, that is to say, with unwashen, hands” (Mark 7:2). Mark explains for his non-Jewish readers that the Pharisees would not eat after coming from the market without washing, and that they had many traditions about “the washing of cups, and pots, brasen vessels, and of tables” (Mark 7:4). Their whole religious system was built around protecting themselves from contamination that came from outside.
Jesus turned that system on its head. “There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man” (Mark 7:15). When the disciples asked Him to explain, He said that food goes into the stomach, not into the heart, and passes on. Mark adds the phrase “purging all meats” (Mark 7:19), which many modern translations render as Mark’s own comment: in saying this, Jesus declared all foods clean.
Then He named where the real danger lies. “For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness.” The list begins with “evil thoughts,” the inner reasonings from which so much else grows. It includes actions, like theft and murder, and attitudes, like pride and “an evil eye,” the envious look that resents another person’s good. All of it, Jesus says, comes “from within.”
This passage is vital for understanding Proverbs 4:23 rightly. The Pharisees were extremely diligent guardians, but they were guarding the wrong thing. They were watching their hands, their cups and their contact with unclean people and places. Jesus says the real source of defilement is the heart.
That has two consequences. First, it makes guarding the heart more serious, not less. You cannot keep yourself pure merely by avoiding certain places, people or objects. The capacity for pride, envy, lust and deceit lives inside you, and it travels with you into the church as easily as into the nightclub. Second, it frees us from a fearful religion of contamination. A believer does not need to live in dread of being polluted by the people he works with, the food he eats at a neighbour’s celebration or the ordinary places of daily life. The greater danger is within, and that is where God’s grace does its deepest work.
Not a fortress against people
This brings us to one of the most common misunderstandings of Proverbs 4:23. Many believers, with the best intentions, have turned “guard your heart” into a reason for suspicion and withdrawal.
Some refuse friendships with unbelievers for fear of being contaminated by them. Some avoid any book, film or conversation that contains a different viewpoint. Some have been taught that eating food at a non-Christian neighbour’s festival will expose them to spiritual danger. Some, like Tobi, have been hurt and have quietly decided never to trust anyone again, and they call it “guarding my heart.” The result is often a life that is closed, anxious and cold.
Paul had to correct exactly this kind of misunderstanding in Corinth:
I wrote unto you in an epistle not to company with fornicators: Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world. But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
In an earlier letter, Paul had told the Corinthians not to keep company with sexually immoral people. They took it to mean that they should withdraw from all such people everywhere. Paul says that is not what he meant at all: “Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.” If believers had to avoid every sinner in society, they would have to leave the planet. His instruction concerned discipline within the church, among those who claim to be brothers and sisters while persisting in open sin.
The same apostle gave remarkably relaxed advice about meat from the market, much of which had been offered in pagan temples: “Whatsoever is sold in the shambles, that eat, asking no question for conscience sake: For the earth is the Lord’s, and the fulness thereof” (1 Corinthians 10:25-26). And if an unbeliever invites you to a meal, “and ye be disposed to go; whatsoever is set before you, eat, asking no question for conscience sake” (1 Corinthians 10:27). Paul does add, in the following verses, that if someone at the meal makes a point of the food’s religious meaning, you should consider their conscience. But his starting point is freedom, not fear.
And Jesus, in His great prayer for His disciples on the night before the cross, said, “I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil” (John 17:15). The Lord wanted His people kept from evil while they lived in the world, with all its contact and company.
Jesus Himself was the clearest example of this. The religious leaders complained constantly that He mixed with the wrong people. “This man receiveth sinners, and eateth with them” (Luke 15:2). He touched lepers. He spoke with a Samaritan woman at a well. He went to dinner at the houses of tax collectors. His heart was perfectly guarded, and precisely because it was guarded, He could go anywhere love required. Contamination did not flow from them to Him. Healing flowed from Him to them.
That is what a guarded heart makes possible. Mrs Adeleke did not guard her well by refusing to let anyone near it. She guarded it so that thirty-seven people in a dry season could drink.
What you welcome and what you cultivate
If guarding the heart is not mainly about keeping people away, what does it involve? Jesus gave us a picture in the parable of the sower. When He explained it to His disciples, He described four kinds of hearers, four kinds of ground. The third and fourth are especially relevant here:
And that which fell among thorns are they, which, when they have heard, go forth, and are choked with cares and riches and pleasures of this life, and bring no fruit to perfection. But that on the good ground are they, which in an honest and good heart, having heard the word, keep it , and bring forth fruit with patience.
The seed is the Word of God, and the ground is the heart. In the third kind of ground, the seed is received, it begins to grow, and then something else grows alongside it. “Choked with cares and riches and pleasures of this life.” These are not exotic temptations. Cares are the worries of ordinary life: rent, school fees, health, the future. Riches are the pursuit and the management of money. Pleasures are the enjoyments of life, many of them perfectly innocent in themselves. None of them is evil in itself. But if they are allowed to grow unchecked, they crowd the Word out, and the result is a hearer who brings “no fruit to perfection.”
That is a sobering picture. A heart can be choked without ever committing a scandalous sin. It can simply become so full of worry, ambition and entertainment that the Word of God has no room to bear fruit.
Then comes the good ground: “which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.” There is our word again: keep. The good-ground hearer keeps the Word, holds onto it, guards it as precious, so that it can grow. And the fruit comes “with patience.” Guarding the heart is the patient, ongoing work of a gardener who keeps pulling weeds so that the good plants can flourish.
This tells us that guarding the heart has two sides. There is what we refuse to let take root: bitterness, envy, impurity, anxious greed, the slow choking of the Word by too many competing cares. And there is what we deliberately welcome and cultivate: the Word of God, received honestly, kept faithfully and given time to grow.
The psalmist puts these two sides together in a famous verse: “Thy word have I hid in mine heart, that I might not sin against thee” (Psalm 119:11). He hides the Word inside, which is cultivation, so that he will not sin, which is protection. A young man asks, “Wherewithal shall a young man cleanse his way?” and the answer comes: “by taking heed thereto according to thy word” (Psalm 119:9). The best way to keep weeds out of a garden is to fill it with good plants.
The treasure that speaks
Jesus gives us one more way to understand what is happening in the heart, and it connects directly to the mouth and lips of Proverbs 4:24:
For a good tree bringeth not forth corrupt fruit; neither doth a corrupt tree bring forth good fruit. For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes. A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.
“A good man out of the good treasure of his heart bringeth forth that which is good.” The heart is described as a storehouse, a treasury. What you put into it is what you will eventually bring out of it. “For of the abundance of the heart his mouth speaketh.” Under pressure, when you are tired, provoked or surprised, the mouth reveals what the heart has been storing.
This gives us a very practical way to examine our hearts. Listen to your own words, especially the ones that come out unplanned. What do you say when the driver cuts in front of you on the Third Mainland Bridge? What do you say about a colleague when she is not in the room? What comes out when your child spills the tea for the third time? Those words are not accidents. They are samples drawn from the well.
That is why the father in Proverbs moves straight from the heart to the mouth: “Put away from thee a froward mouth, and perverse lips put far from thee.” A crooked mouth is the outflow of a crooked treasure. Guarding the heart will gradually change what we say, and paying attention to what we say will help us see what needs attention in the heart.
Notice that Jesus speaks of the tree being known by its fruit. This works both ways. It is a warning, because bad fruit reveals something about the tree. But it is also an encouragement, because good fruit cannot be manufactured on the surface. It grows from good roots. When a believer’s speech becomes kinder, more truthful and more gracious over time, it is evidence that the treasure within has been changing.
A new heart that still keeps watch
A careful reader might ask a question here. Under the New Covenant, God has promised to give His people a new heart. “A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh” (Ezekiel 36:26). Through Jeremiah, He said, “I will put my law in their inward parts, and write it in their hearts” (Jeremiah 31:33). If believers have received a new heart, why should they still need to guard it?
It is a good question, and the answer is important. The new heart is real. The believer has been born again, made a new creation, given the Spirit of God to dwell within. We must never speak to Christians as though their hearts were still the same stony hearts they had before Christ. Your deepest desire, as a child of God, is to please your Father. That is the new heart at work.
But the New Testament also speaks honestly about the ongoing presence of the flesh, about the deceitfulness of sin and about the need for watchfulness. The writer to the Hebrews, addressing believers, says: “Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin” (Hebrews 3:12-13). Believers can be deceived. A heart that has been made new can still be choked by cares, chilled by bitterness or hardened by repeated compromise.
Sincere believers differ on exactly how to describe this, with some emphasising the completeness of the new nature and others the ongoing struggle with the flesh. But almost all agree on the practical point. Under the New Covenant, guarding the heart becomes the wise care of a gift, far removed from a fearful effort to keep a wicked heart under control. The well is new and clean. That is exactly why it is worth guarding.
And notice that the writer to the Hebrews makes it a community matter: “exhort one another daily.” You do not guard your heart alone. Brothers and sisters watch with you. They notice when your words have grown sharp, or when you have withdrawn, or when the cares of life are beginning to choke you. Guarding the heart includes letting others help you guard it.
Filling the heart with what is worthy
The most practical guidance in the New Testament on guarding the heart comes, appropriately, right after a promise that God Himself guards it. Paul tells the Philippians that “the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus” (Philippians 4:7). Then he goes on: “Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things” (Philippians 4:8).
There are two keepers here. God keeps the heart with His peace. And the believer keeps the heart by choosing what to dwell on. These do not compete. God’s guarding is the foundation, and our attention cooperates with it.
Look at the generosity of Paul’s list. It tells us what to welcome. Paul could have written, “Whatever is dangerous, run from it.” Instead he says, in effect, “Whatever is good, wherever you find it, give it your attention.” The true, the honest, the just, the pure, the lovely, the admirable. This is a heart turned towards goodness, with no need to crouch behind defences. A believer can find things worth thinking on in a well-made piece of music, in the honest work of a colleague who is not a Christian, in a sunset over the lagoon, in the kindness of a stranger, as well as in Scripture and worship.
Then verse 9: “Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.” Guarding the heart is completed by action. This matches the father’s instruction in Proverbs 4: “Ponder the path of thy feet, and let all thy ways be established.” What the heart holds must reach the feet.
So what does this look like in practice?
It means paying attention to what you welcome through your ears and eyes. That does not require fear of every film or conversation. It does require honesty about what regularly feeds bitterness, lust, envy or anxiety in you, and the courage to turn away from it, just as Mrs Adeleke refused to let a dirty bucket into her well.
It means cultivating the Word deliberately, not as a charm but as seed, given time and room to grow. It means noticing the cares that are choking you, and bringing them to God before they crowd out everything else.
PunchlineIt means listening to your own words as samples from the well, and treating a sharp or bitter mouth as a sign that something within needs attention.
It means keeping company with people who will exhort you, and being that kind of friend to others.
And it means remaining open to people, generous with your life, willing to be hurt again if love requires it, because a guarded heart is a heart kept clean enough to give. “He that hath no rule over his own spirit is like a city that is broken down, and without walls” (Proverbs 25:28). A city without walls is defenceless. But a city with walls and no gates is a prison. Wisdom builds walls with gates in them.
After that sermon, Tobi drove from Lagos to Ibadan for the first time in years. His grandmother had died long before, and the compound now belonged to his uncle. But the well was still there, with the same iron lid, a little more rusted, and a newer bucket tied to the rope.
He stood beside it for a while. He thought about the business partner who had lied to him and taken the money. That hurt had been real, and the wisdom he had learned from it was real too. He would never again sign a contract without reading every page, and he had learned to watch a person’s conduct over time before trusting them with a great deal. That was a good kind of guarding. But he thought too about the friendships he had let die, the fellowship group he had stopped attending, the way he had begun to answer his wife in short, careful sentences, the way he had refused to help a younger colleague who reminded him of the man who betrayed him. He had put the lid on and locked it. And he had told himself it was wisdom.
“If the water is dirty, what will I give them?” He could almost hear her voice.
He realised that his heart had not become clean behind the lock. It had grown stagnant. Bitterness had been sitting in it for three years, unstirred and undrawn, and it had begun to taint everything that came out of him. Grandma had guarded the well against what would pollute it. She had never guarded it against the people who needed to drink.
He went home and did several things over the following months. He talked honestly with his pastor about the betrayal and about the bitterness that had followed it. He forgave the man before God, which took longer than he expected and did not mean pretending that what had happened was acceptable. He went back to his fellowship group. He apologised to his wife for the distance he had kept. And he called the younger colleague and offered to mentor him.
“I am guarding my heart now,” he told me some time later. “Properly, this time. I watch what goes into it. I keep the Word in it. I pay attention when my words turn sour. But I have taken off the padlock. The lid closes at night. In the morning, people can come and draw.”
That is the wisdom of Proverbs 4:23. Keep your heart above all keeping, because out of it flow the streams of your life, and because others will drink from what flows out. Guard it with the care of a woman who closes the lid every night and cleans the walls every year. And then open the gate in the dry season, and let the whole street come.
Teaching Companion
For Reflection
- Before reading this, what did you understand “guard your heart” to mean? How has your understanding changed?
- Jesus said that defilement comes from within, not from outside. How does that free you from fear, and how does it make guarding your heart more serious?
- Which cares, riches or pleasures of this life might be choking the Word in your heart at present?
- If your unplanned words are samples from the well, what do they reveal about the treasure in your heart?
- Have you ever called withdrawal, suspicion or bitterness “guarding my heart”? What would it look like to keep the walls but open the gates?
This Week
This week, keep a short note at the end of each day under two headings. Under “What I welcomed,” write down what you listened to, watched, read and thought about most, and ask whether it fed or choked the Word in you. Under “What flowed out,” write down one or two things you said that surprised you, whether good or bad, and ask what they reveal about your heart. Memorise Proverbs 4:23 and Philippians 4:8. Then choose one relationship you have closed off out of fear or hurt, and take one small, wise step to reopen it.
A Prayer
Father, thank You for the new heart You have given me in Christ, and for the peace that guards my heart and mind. Teach me to keep my heart with all diligence, because out of it are the issues of life. Show me what I have welcomed that is choking Your Word, and give me grace to turn away from it. Let Your Word dwell richly in me and bear fruit with patience. Guard me from a fearful religion of contamination, and from a cold heart that calls bitterness wisdom. Make my heart a clean well from which others can drink, and give me the courage to open the gate. In Jesus’ name, Amen.
Truth received brings freedom. Truth believed establishes the heart.
Scripture quotations are from the King James Version. · Illustrations using first names only are composites unless stated otherwise.