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Part 6 in the Series: The Covenant Wisdom of God Series
“Death and life are in the power of the tongue, and those who love it will eat its fruit.”
— Proverbs 18:21
Introduction
We live amid abundant and careless speech. We speak through conversations, texts, emails, podcasts, comments, and posts that can be sent before a thought has been weighed. The abundance of words may create the illusion that words are cheap. However, Scripture teaches otherwise: “Death and life are in the power of the tongue” (Prov. 18:21). Our words are morally weighty. They reveal the heart, affect our neighbors, and bear witness to the Lord whose name we confess.
The point is not simply that Christians should become more polite. And this is far more than a call to better manners. Speech belongs to covenant faithfulness. Proverbs teaches the fear-of-the-Lord wisdom by which God’s people bring their speech under his holy rule. For believers, this wisdom is fulfilled and rightly understood in Christ, the wisdom of God (1 Cor. 1:24, 30). United to him, they learn by the Spirit to speak as those being renewed in his image. Speech is one ordinary place where that renewal becomes audible.
Life and Death in the Tongue
Proverbs 18:21 declares, “Death and life are in the power of the tongue, and those who love it will eat its fruit.” Words can damage reputations, divide families, unsettle a congregation, and crush a tender conscience. They can also comfort the afflicted, defend the weak, reconcile the estranged, and strengthen faith.
The proverb does not invite us to admire the tongue’s power. It warns that those who habitually give themselves to speech will “eat” of its fruit: words bring consequences fitted to their character.1 Reckless speech reaps distrust, shame, and strife. Speech governed by the fear of the Lord becomes an instrument of peace and encouragement.
This duty belongs to the covenant life of the Christian. Israel was commanded to keep God’s words in its heart and teach them diligently in the household (Deut. 6:6–9). It was forbidden to lie, deal falsely, slander, or hate one’s neighbor in the heart (Lev. 19:11–18). Truthful speech reflected the holy character of God. The church does not outgrow this obligation. We as believers are to put away lies and speak truth with our neighbors “…for we are members of one another” (Eph. 4:25). Speech either serves or wounds Christ’s body. Proverbs 15:1–2 guides us in the way of wise speech:
A soft answer turns away wrath,
but a harsh word stirs up anger.
The tongue of the wise commends knowledge,
but the mouths of fools pour out folly.
A soft answer is not timidity or a refusal to name sin. It is wisdom that refuses needless escalation. There are occasions for plain reproof, but harshness must never govern Christian speech. The wise person speaks with restraint, discernment, and a desire for peace.
Christ displays this holy gentleness. He did not break a bruised reed or quench a faintly burning wick (Isa. 42:3; Matt. 12:20). He received needy sinners tenderly and exposed hard-hearted hypocrisy without compromise. His gentleness was strength, ordered by truth and love. His people should display the same disposition at home, in the church, in disagreement, and before the world.
Proverbs 12:18 gives a further notion: “There is one who speaks like the piercings of a sword, But the tongue of the wise promotes health.” Rash words issued from anger, pride, envy, fear, or the desire to win an argument before love consider their effect. They can embitter a marriage, disgrace a brother, or spread pain through a church. The Epistle of James, often called “the Proverbs of the New Testament” for its practical wisdom, likewise compares the tongue to a fire capable of setting a great forest ablaze (James 3:5–6).
Yet James does not leave the believer only with a warning. He calls the church to the wisdom from above: wisdom that is “… pure, then peaceable, gentle, willing to yield, full of mercy and good fruits, without partiality and without hypocrisy.” (James 3:17). Such wise speech is neither flattery nor cowardly silence. It tells the truth in love, without compromise, and seeks the hearer’s good. Calvin explains that Ephesians 4:29 requires speech fitted for edification: words that bring comfort, counsel, and what serves the soul’s salvation.² Applying that principle, we must ask not only, “Is this true?” but also, “Will it serve this person’s spiritual good?”
That question also calls for restraint. Speech that truly serves another’s spiritual good is not measured by its abundance, but by its wisdom, truthfulness, and fitness for the moment. Proverbs 10:19 therefore commends the much-needed discipline of restraint: “In the multitude of words sin is not lacking, But he who restrains his lips is wise.” Not every accusation or harsh statement requires an answer; not every opinion needs to be aired; nor should every true observation be proclaimed immediately. Restraint is not evasiveness. Rather, it refuses to let anger, vanity, or impatience rule the tongue.
From Heart to Mouth
Sinful speech is deeper than poor verbal discipline. “Keep your heart with all diligence, for out of is springs the issues of life” (Prov. 4:23). Jesus states the connection directly: “… Out of the abundance of the heart the mouth speaks” (Matt. 12:34; cf. Luke 6:45). It is the mouth that reveals what the heart treasures.
James makes the diagnosis sharper. With the same mouth people bless God and curse those made in his likeness; “… My brethren, these things ought not to be so” (James 3:9–10). Malicious speech, gossip, flattery, boastfulness, and cutting criticism often expose idolatry: love of self, hunger for approval, resentment, fear of man, or a desire to control others.3
We may improve our tone while the heart remains proud and unloving. The Spirit must cleanse the source of our malicious words. As Christ rules the heart, the tongue begins, through repentance, to bear a different and sweet-tasting fruit.
This is also why speech is a covenant interest. Psalm 15 describes the worshiper who speaks truth in his heart, refuses slander, and does not disgrace his neighbor (Ps. 15:1–3). Zechariah commands the restored people to speak truth, reject evil in the heart, and refuse false oaths (Zech. 8:16–17). God means his people to be a community where truth and love meet.
The ninth commandment makes this duty concrete. It requires us to preserve and promote truth, defend a neighbor’s good name, and speak truth charitably. It forbids lying, slander, backbiting, tale-bearing, rash censuring, and even true speech uttered unseasonably or maliciously.4 This standard moves conversations, prayer requests, online speech, and the way we speak of those who are not present.
Christ and the New Man
Our hope for sanctified speech rests in Christ, not self-improvement. He is the wisdom of God, and every word he spoke perfectly revealed the Father’s will. When Satan tempted him in the wilderness, Christ answered with the written Word, refusing both falsehood and self-exaltation and remaining perfectly obedient to his Father (Matt. 4:1–11). He spoke life to sinners, truth to the confused, warning to the self-righteous, and comfort to the afflicted. He never uttered a sinful word.
His sinless speech exposes us absolutely and completely. Jesus warns that people will give account for every careless word (Matt. 12:36–37). Our sinful words are not trivial before a holy God. They belong to the guilt for which we need forgiveness. Yet Christ did not merely give an example that leaves us condemned. At the cross, he bore the judgment due to his people. When he cried, “It is finished” (John 19:30), he declared the completed work by which sins are forgiven, and his people are set apart for God (Heb. 10:10–14). The atonement reaches the concrete sins of the tongue for which believers rightly grieve.5
Those united to the risen Christ are made new. Thomas Watson writes, “Grace is called ‘the new man’ … not a new eye, or tongue, but a new man.”6 The Spirit renews our mind and affections and trains the tongue for obedience. James says no human being can tame the tongue by natural power (James 3:7–8). But the God who gives new birth grants wisdom from above, pure, peaceable, gentle, open to reason, full of mercy, and sincere (James 1:18; 3:17). That is the wisdom God produces in his people.
Daily Application
Self-Examination
Examine your words this past week. Where have they been sword thrusts rather than medicine? Have you multiplied words needlessly? Have you repeated information that weakened someone’s reputation? Have you spoken with impatience to those nearest to you? Such questions are not meant to produce vague guilt. They help us identify particular sins that need confession and repentance.
Godly Humiliation
Careless speech should humble us before God. We have failed to love our neighbors when we have lied, exaggerated, mocked, gossiped, nursed resentment through our words, or spoken true things from a malicious heart. Sin reaches even ordinary sentences that seem insignificant. Yet this humiliation is not despair: we need Christ’s cleansing blood for sins of speech as surely as for sins of deed.7
Faith and Hope
Christ receives repentant sinners. He bore their condemnation, intercedes for them, and gives his Spirit to change them. Forgiveness does not make our words unimportant; Forgiveness makes honest repentance possible. A Believer who has wounded another with their words may confess their sin without self-justification, seek reconciliation where possible, and trust Christ to make their speech increasingly gracious.
Holy Resolution
Resolve by grace to practice wise speech. Pause when anger rises. Refuse to circulate an unverified report or one that does not serve a neighbor’s good. Speak directly and charitably when correction is required. Let Scripture and prayer slow you down. Calvin’s question from Ephesians 4:29 is useful: Will this build up? The Westminster Larger Catechism adds another: Does this preserve truth and serve my neighbor’s good name?8
The tongue is not a peripheral concern in the Christian life. It is one of the clearest places where fear of the Lord, love of neighbor, union with Christ, and the Spirit’s renewing work become audible. Let us therefore pray with the psalmist, “Set a guard, O LORD, over my mouth; keep watch over the door of my lips!” (Ps. 141:3). And let us ask God to fill our hearts with his Word, so that our words may become fitting witnesses to the grace we have received.
Endnotes
Unless otherwise noted, all Scripture quotations are from the New King James Version.
1 Bruce K. Waltke, The Book of Proverbs: Chapters 15–31, New International Commentary on the Old Testament (Grand Rapids: Eerdmans, 2005), on Proverbs 18:21; Tremper Longman III, Proverbs, Baker Commentary on the Old Testament Wisdom and Psalms (Grand Rapids: Baker Academic, 2006), on Proverbs 18:21.
2 John Calvin, Commentary on the Epistle to the Ephesians, trans. William Pringle (Edinburgh: Calvin Translation Society, 1854), on Ephesians 4:29.
3 John Calvin, Commentary on a Harmony of the Evangelists, Matthew, Mark, and Luke, trans. William Pringle (Edinburgh: Calvin Translation Society, 1845), on Matthew 12:34–37; Westminster Larger Catechism, Q. 145.
4 Westminster Larger Catechism, Qq. 143–45.
5 John Calvin, Commentary on the Gospel According to John, trans. William Pringle (Edinburgh: Calvin Translation Society, 1847), on John 19:30; Westminster Larger Catechism, Q. 152.
6 Thomas Watson, The Godly Man’s Picture (Edinburgh: Banner of Truth Trust, 1992).
7 Westminster Larger Catechism, Q. 145.
8 Calvin, Commentary on the Epistle to the Ephesians, on Ephesians 4:29; Westminster Larger Catechism, Q. 144.
