Proverbs 27:19 compares what a heart reveals about a person to a face reflected in water. What I love and believe will show itself in my words and conduct, even when I try to present a different image. Yet I can deceive myself about my own motives. To examine my heart honestly, I need God’s Word to correct me and Christ to provide the cleansing that self-examination cannot.
The Heart Reveals the Person
The proverb begins with something familiar:
As in water face reflects face, so a man’s heart reveals the man.
Still water reflects the face of the person looking into it. In the same way, the heart reveals who a person is. We can understand the comparison without assigning a hidden spiritual meaning to the water.
When we speak about the heart today, we often mean our emotions. Scripture uses the word more broadly for our inner life, including thought, desire, intention, and moral judgment. A person believes in the heart (Romans 10:10), treasures things there (Luke 2:19), and purposes in the heart to give (2 Corinthians 9:7). The heart can also become hardened against God (Hebrews 3:8). We are considering what a person trusts, values, and chooses as well as what he feels.
Those inward commitments influence how we live. Someone may speak pleasantly while deliberately cheating another person, but the deception shows how much he values gain over honesty. Bitterness may stay hidden during polite conversation and then surface in a cutting remark. As a person learns to fear God, that change should become evident in truthfulness, mercy, and a willingness to admit wrong.
Proverbs therefore tells us to attend carefully to this source of our conduct:
Keep your heart with all diligence, for out of it spring the issues of life.
Guarding my heart includes paying attention to what I welcome into my thinking and the desires I keep feeding. If I rehearse another person’s faults until I feel justified in mistreating him, I am helping resentment grow. Harsh words then express what I have been cultivating within. I should stop speaking harshly, but sounding more courteous will not by itself deal with the resentment behind my words.
Another proverb is often quoted as “as he thinks in his heart, so is he.” In Proverbs 23:6-8, the setting is a miser offering food while inwardly begrudging what he offers. His invitation sounds generous, but his heart is not with his guest. The passage warns us about that discrepancy. It does not promise that thinking positively will create a different reality or make our wishes come true.
Proverbs 27:19 also calls for caution when I judge someone else’s heart. Words and actions give us real evidence, and we can identify conduct Scripture plainly condemns. Recognizing a lie, however, does not mean I know every reason the person told it or everything else about his soul. I need to examine my own heart before the Lord who knows it completely.
The Heart Bears Fruit but Can Deceive
Jesus explained the connection between the heart and conduct through a tree and its fruit. Good fruit comes from a good tree, and bad fruit from a bad tree. Applying that comparison to speech, He said, “For out of the abundance of the heart the mouth speaks” (Luke 6:45). Our words draw on what we have stored within. If I keep slandering someone, I cannot honestly insist that those words have nothing to do with what I think of him.
One foolish sentence does not tell me everything about a person’s spiritual condition. A believer can sin with his mouth and then repent of what he said. Repentance should include acknowledging the harm and seeking to put it right. Dismissing the words as meaningless leaves that harm unaddressed. A repeated pattern of contempt, deceit, or delight in another person’s suffering calls for serious attention to the heart producing it.
In Matthew 12:36-37, Jesus warned that people would give account for every idle word and that their words would justify or condemn them. We are accountable to God even for words we regard as casual. Careful vocabulary cannot earn salvation, but cruel or deceitful speech can expose a false profession of faith. Calling myself a Christian gives me no excuse to wound people with lies or use God’s name to conceal cruelty.
Actions provide evidence too. Giving to someone in need can express love, while secretly exploiting him reveals a willingness to use him for gain. Honesty, sexual purity, patience, and mercy are fitting results of God’s work in a believer. We should look for such fruit while remembering that one generous act does not reveal everything about a person.
There is a further difficulty: the heart that influences our conduct can deceive us about that conduct. Jeremiah puts the warning beside God’s answer:
The heart is deceitful above all things, and desperately wicked; who can know it?
I, the LORD, search the heart, I test the mind
Advice to follow my heart is unreliable when my heart can make selfishness appear reasonable. I may call lust love, greed responsible planning, or gossip concern for a friend. I may say I am being patient when I am really avoiding an awkward conversation about something I know is wrong. Changing the description does not change what God sees.
James 1:23-24 compares the person who hears God’s Word without doing it to someone who looks at his face in a mirror and then forgets what he saw. The hearer has encountered the truth but goes away without acting on it. I can read a passage that exposes my dishonesty and still explain away the very behavior it addresses. Recognizing the problem gives me no reason to congratulate myself if I continue refusing to obey what God has shown me.
God Searches What We Cannot See
God’s knowledge of the heart also corrects our judgments about other people. When Samuel came to Jesse’s household to anoint a king, he assumed Eliab must be the LORD’s anointed. The LORD told Samuel why appearance was an inadequate basis for that conclusion:
For the LORD does not see as man sees; for man looks at the outward appearance, but the LORD looks at the heart
God chose David, who was outside keeping the sheep and had to be brought in. He knew what Samuel could not discover by looking at the brothers. His choice did not mean David would never sin, as David’s later life makes painfully clear. It shows why an impressive appearance cannot establish a person’s fitness before God.
A ministry title, a polished account of my intentions, or other people’s admiration cannot conceal corruption from Him. He also sees sincere faith and obedience when other people overlook them. I can be mistaken in either direction, admiring someone because he is impressive or dismissing someone because he seems unimportant. God does not need either my praise or my suspicions to tell Him who that person is.
Later, after David committed adultery with Bathsheba and arranged Uriah’s death, Nathan confronted him with his wrongdoing. David needed more than a repaired reputation. He prayed, “Create in me a clean heart, O God, and renew a steadfast spirit within me” (Psalm 51:10). His prayer appeals to God’s mercy for cleansing and also asks for the joy of salvation to be restored.
David’s prayer helps us respond when our conduct exposes what we have been excusing. God does not ask us to disguise it with religious language. We can confess the wrong and seek the cleansing Christ provides.
Psalm 139:23-24 gives us another prayer from David. He asks God to search him, know his anxieties, expose any wicked way, and lead him in the everlasting way. I can pray that honestly because the Lord who exposes sin also knows how to lead me out of it. Asking Him to search me means welcoming the truth and His help, even when He corrects my favorable opinion of myself.
Asking God to search me is different from granting another person unlimited authority over my inner life. A spouse, parent, pastor, or close friend may recognize conduct I have overlooked, but none possesses God’s perfect knowledge. We should listen to correction, ask honest questions, and address what can be established. Claiming to know someone’s hidden motives without evidence can turn a useful conversation into an unjust accusation.
A New Heart and Honest Examination
Knowing what is wrong with our hearts cannot by itself make them new. We need God to give us life. Through Ezekiel, He promised Israel:
I will give you a new heart and put a new spirit within you
In the surrounding passage, God promises to replace a heart of stone with a heart of flesh and put His Spirit within His people so they will walk in His ways. He promises inward change along with Israel’s restoration. Receiving the new covenant blessings through Christ does not cancel those promises to Israel. When a person believes in Jesus, God forgives him, makes him a new creation, and gives him the indwelling Holy Spirit.
When I speak of regeneration, I mean genuinely being born again. A person can call himself a Christian, attend worship, and learn the right language without having received that new life. The life God gives should become evident in how he responds to Him. The believer now has reason and power to obey Christ, and when he sins he should repent rather than defend his sin as acceptable.
New birth does not make a Christian sinless or remove every temptation. A painful struggle with an established habit may require patient, practical help. Resisting temptation is also different from consenting to it; an unwanted thought is not automatically a chosen sin. We should consider how a person responds to God in the struggle, without pretending that spiritual growth means never facing another battle.
Discipline and changed habits have a place in a Christian’s growth, but they cannot manufacture new birth. That life is received by grace through faith in the Savior who died and rose for sinners.
Feelings alone cannot tell us whether we are responding rightly. One person feels confident while continuing in serious sin, and another remains troubled after honestly confessing a sin God has forgiven. We need Scripture to test our conclusions. Paul describes God’s Word in Hebrews 4:12 as living and powerful, discerning the thoughts and intentions of the heart. Read in context, Scripture can expose an excuse we have made, correct a false accusation we have accepted, and show us what faithfulness actually requires.
Faithful preaching, memorized Scripture, prayer, and fellowship with wise believers help us apply that Word. Someone who knows us may notice that we blame every angry outburst on other people or always find a reason to resent another person’s success. We should be willing to hear him. He may also need to remind us of the gospel when examination becomes an endless search for something else to condemn.
Useful questions are specific enough to answer: what have I said, whom have I harmed, and what am I continuing to excuse? When I am afraid, do I ask God for help or justify conduct He forbids? Can I rejoice when another person receives something good? We do not need to analyze every passing feeling until we despair. We need to respond honestly to what God has made clear and accept the help He provides.
Repentance, Growth, and Christ’s Cleansing
When God exposes sin, repentance includes a change of mind that turns us away from that sin and toward Him. Feeling embarrassed that someone found out is not the same as acknowledging that we have done wrong. If I have cheated someone, I need to admit the deception and seek to repay what I took. If I spread a false accusation, I should correct it with the people who heard it. Where restitution is possible, repentance should lead us to make it.
1 John 1:7 teaches that the blood of Jesus Christ cleanses believers who walk in the light. Verse 9 assures us that God is faithful and just to forgive and cleanse when we confess our sins. Confession agrees with God’s judgment about what we have done. I do not need to persuade Him to become merciful or act as though Christ’s blood is insufficient until I produce enough remorse.
Practical changes help us stop feeding the sin we have confessed. An immoral relationship needs to end. A concealed addiction should be brought into the light with trustworthy help, and online temptation may call for limits and accountability that make further secrecy harder. Those decisions do not purchase forgiveness. They express a willingness to stop defending the conduct for which we have asked forgiveness.
Some long-standing patterns take time and sustained help to overcome. Struggling against a sin is different from making peace with it, and the presence of a struggle does not by itself prove that someone was never converted. We should encourage confession, responsible action, and dependence on the Spirit while refusing to excuse ongoing harm. Other people should not have to endure mistreatment because the person doing it says he is still growing.
2 Corinthians 3:18 describes how the Spirit changes believers into the Lord’s image, from glory to glory. Growth includes learning to tell the truth more readily, receiving correction without retaliation, and showing mercy where we once acted selfishly. These changes develop as we attend to Christ and His Word. We can acknowledge unfinished growth without hiding the areas where obedience is already clear.
Jesus Himself had no corrupt heart to cleanse. His love for the Father was evident in truthful speech, mercy, and obedience even unto death. He is the eternal Son of God, fully God and fully man, who lived without sin. He came to save people whose hearts and conduct reveal their need for forgiveness.
At the cross, Jesus voluntarily gave Himself to be slain as the perfect sacrifice for our sins. Wicked people inflicted His physical torture, and He willingly shed His blood and died. His saving sacrifice was complete before His burial and bodily resurrection. The Father did not punish, curse, abandon, strike, bruise, or pour wrath on Jesus. Father, Son, and Holy Spirit were united in this work of salvation. His blood is sufficient for the sins our words and actions expose.
Christ died for the sins of the whole world, and God’s invitation to repent and believe is genuine for every person. We can resist His grace, but everyone who turns to Him in faith receives forgiveness and new life. The Spirit indwells and permanently seals the believer, securing him in Christ. That assurance gives us reason to confess sin and obey Him without trying to earn salvation or keep ourselves saved.
Looking more closely at my own heart will never accomplish what Christ’s blood does. Honest examination is useful when it brings me to confess sin, trust His mercy, and obey what He has shown me. I do not have to hide from the Lord who already knows the truth about me and has provided the cleansing I need.
Related Studies
What Sin Is explains sin as rebellion against God and the need for forgiveness through Christ.
Repentance examines biblical repentance as a truthful turning from sin toward God.
Being Born Again explains the new life God gives through faith in Jesus Christ.
The Fruit of the Spirit considers the Spirit-produced character that grows in a believer’s life.
My Final Thoughts
Proverbs 27:19 makes me consider whether the life I present to others agrees with the heart God sees. I can deceive myself about my motives, but I cannot deceive Him. When His Word exposes a wrong I have been excusing, I need to confess it and respond, trusting the Savior who shed His blood and rose bodily for sinners. The Spirit gives new life and produces its fruit in us, so honest examination can lead to repentance and hope rather than concealment or despair.