Does the tongue really have the power of life and death?

from the old testament

• “Death and life are in the power of the tongue, and those who love it will eat its fruits” (Proverbs 18:21). In Proverbs, “tongue” refers to our speech—the words we choose and how we deliver them. Scripture states that speech is real action with real consequences, so speaking is never neutral. Our words can lead people toward wisdom or toward ruin, so it is better to restrain our words than speak without wisdom (Proverbs 10:19; 17:27–28).
• The Old Testament provides examples of how speech can cause harm. False testimony can ruin an innocent person's life, which is why God forbade bearing false witness and mandated severe penalties for perjury (Exodus 20:16; Deuteronomy 19:15–21). Solomon states, “A man who bears false witness against his neighbor is like a war club, or a sword, or a sharp arrow” (Proverbs 25:18).
• The Psalms depict hostile speech as weapons: “[They] whet their tongues like swords, who aim bitter words like arrows” (Psalm 64:3). Psalm 140:3 speaks of slander as venom: “They make their tongue sharp as a serpent’s, and under their lips is the venom of asps.” Reckless and harsh words escalate conflicts—“a harsh word stirs up anger” (Proverbs 15:1)—and careless talk causes wounds like “sword thrusts” (Proverbs 12:18).
• Conversely, wise speech gives life. “The mouth of the righteous is a fountain of life,” because it refreshes and directs people toward what is good (Proverbs 10:11). A gentle reply “turns away wrath” (Proverbs 15:1) and measured counsel “brings healing” (Proverbs 12:18). Pleasant words can carry truth in a way that sinks in: “Gracious words are like a honeycomb, sweetness to the soul and health to the body” (Proverbs 16:24). Instruction is life-preserving: “The teaching of the wise is a fountain of life, that one may turn away from the snares of death,” and faithful parents set a child on a safe path with steady, formative words (Proverbs 13:14; 22:6).

from the new testament

• James begins with a serious warning about the power of the tongue. “How great a forest is set ablaze by such a small fire! And the tongue is a fire” (James 3:5–6). He emphasizes that those who teach “will be judged with greater strictness,” because their words influence many (James 3:1). Words (the tongue) have such a strong impact that the consequences can be severe.
• Jesus explains why speech matters forever: “On the day of judgment 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” (Matthew 12:36–37). He was not saying that words save or condemn all on their own but that our word choices show what the heart truly believes about Him. God’s judgment considers that evidence carefully.
• The New Testament provides examples of harmful speech. For instance, slander, gossip, and reviling damage communities and harden hearts (James 4:11; 1 Timothy 5:13; 1 Peter 2:1; 2 Corinthians 12:20). Quarreling and “irreverent babble” spread like infection (2 Timothy 2:16). Paul warns churches that reckless talk destroys people: “But if you bite and devour one another, watch out that you are not consumed by one another” (Galatians 5:15). Persistent reviling belongs to the old life that faces judgment without repentance (1 Corinthians 6:9–10).
• In contrast, Christian speech aims to offer grace. Paul instructs, “Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear” (Ephesians 4:29). He adds, “Let your speech always be gracious, seasoned with salt” (Colossians 4:6). Speech should encourage others and help protect them (Hebrews 3:13; 1 Thessalonians 5:11). Most importantly, God uses words to bring people from death to life as the gospel is confessed and heard in faith (Romans 10:9–14, 17), and restoring words can even “save his soul from death” when a wanderer is brought back (James 5:19–20).

implications for today

Choose your words carefully. Everything you say now and in the future has real significance, so speak in ways that honor God and lead others to Jesus. Treat every environment—home, work, church, and online—as a place to practice speech that honors God. Avoid slander, sarcastic words that hurt, and careless exaggeration. Commit to speaking truthfully, gently, timely, and helpfully. Your goal should be to strengthen the weak, de-escalate anger, patiently correct mistakes, and make Christ more visible (Ephesians 4:29; Colossians 4:6).

If your past words have caused harm, remember that in Christ, God forgives sinful speech. Approach those you’ve hurt and ask for forgiveness. Then, replace destructive patterns with daily habits of prayerful restraint and Scripture-inspired words. The Holy Spirit can not only help you restrain your tongue but also restore what has been broken and turn your future words into channels of life.

Aim high: use your words to bless instead of curse, to witness instead of gossip, and to reconcile instead of divide. Speak so that God's greatness is clear and Jesus is unmistakable. Your words carry eternal weight—so let them serve God's glory and the good of others.