1 John 2:4 Meaning: When Your Words About God Don't Match Your Life
One who says, “I know him,” and doesn’t keep his commandments, is a liar, and the truth isn’t in him.
He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him;
he who is saying, `I have known him,' and his command is not keeping, a liar he is, and in him the truth is not;
He that says, I know him, and does not keep his commandments, is a liar, and the truth is not in him;
Meaning in one sentence
1 John 2:4 says claiming to know God while disobeying His commands is a lie. See how this fits with grace and John's offer of an advocate.
Context
John writes to a church troubled by false teachers. Some claimed special knowledge of God yet lived as if His commands did not matter. Already in this chapter John has given warm assurance: if any believer sins, Jesus Christ the righteous is our advocate with the Father (1 John 2:1-2). But now he draws a line. The same Greek verb for knowing appears in verse 3 and verse 4. John will not let his readers confuse grace with a cheap claim. Real knowledge of God reshapes how a person lives. This verse is not aimed at a struggling Christian but at anyone who wraps a disobedient life in spiritual words.
Key Words
Two Greek words carry the weight of this verse. The verb for know (egnōka, from ginōskō) is in the perfect tense: “I have known and still know.” It does not mean a casual acquaintance or a theological fact. It suggests a deep, ongoing relationship. John says that if this kind of knowledge is real, it cannot exist apart from keeping His commands.
The word for commandments (entolas) refers to specific instructions from Jesus. They are not optional suggestions. And the word for keeping (tērōn) means to guard and watch over, like a shepherd protecting a flock. It is an active, careful obedience, not a perfect record, but a life that treasures what God says.
Then comes the hard word: liar (pseustēs). Not just “telling a lie” but being a false person, one who breaks faith. And truth (alētheia) is not in that person, not the reality of God, not the genuine article. John is saying that a life of claimed knowledge without obedience is a contradiction at the core of a person’s being.
How Christians Read This Verse
Christians across traditions have heard this verse as a sober warning. Reformers like Calvin stressed that true knowledge of God is always “efficacious”, it changes how we live. Matthew Henry called it “the trial of our light.” Wesleyan commentators like Adam Clarke applied it to those who “pretend to religious knowledge” while living in sin.
Some traditions emphasize that this verse does not describe a person who stumbles into sin but one who claims to know God and has no intention of obeying. Others see it as a call to examine whether our profession matches our conduct. Both readings agree that the verse cannot be used to shame a struggling believer; John has already provided the advocate for that very purpose.
A common misunderstanding
A common misreading goes like this: “This verse means if I ever disobey God, I must not really know Him, so I am a liar.” That would contradict John’s earlier point that believers who sin have an advocate. In fact, John is describing a person who claims to know God while living in deliberate, ongoing disobedience, not a believer who falls and gets back up. The sharp language targets a settled pattern, not a single failure.
Living This Out
This week, pick one area of your life where your words and your actions do not match. It might be how you speak to your spouse, how you handle money, or what you watch on a screen. Do not rush to fix it. First, bring it honestly to God. Say, “I say I know You, but here I am not keeping Your command.” Then ask Him to close that gap. John does not leave you without hope. The advocate is real. But the call to obedience is real too.
Main takeaway: Knowing God is not a label you claim; it is a life that bears the shape of His commands.
For Families
For ages 5, 8
If you say you love your mom but don’t do what she asks, your words don’t mean much. God wants us to obey Him, not just say we know Him.
For ages 9, 12
Saying you know God is like saying you are best friends with someone. If you never listen to what they say or do what they ask, are you really friends? John says real friendship with God shows in how we follow His commands. Not perfectly, but honestly.
Questions People Ask
Does 1 John 2:4 mean Christians must be perfect to be saved?
No. John already wrote that believers who sin have an advocate, Jesus Christ (1 John 2:1-2). Verse 4 targets people who claim to know God but live in a pattern of disobedience without concern. It is about the direction of a life, not sinless perfection.
What did John mean by 'I know Him'?
The Greek verb (egnōka) is in the perfect tense, meaning an intimate, ongoing knowledge. It is more than knowing facts about God. It means having a real relationship with Him, the kind that naturally leads to obedience.
Does 'commandments' here refer to the Ten Commandments?
Primarily it refers to the commands of Jesus, which include love for God and neighbor. John may also have in mind the specific teachings he gives in this letter, like walking in the light and loving one another. The Ten Commandments are part of this, but the focus is on Christ’s instruction.
How does this verse fit with the earlier promise of an advocate?
John balances two truths: believers have a advocate when they sin (2:1-2), but genuine faith produces obedience. Verse 4 warns against using grace as an excuse to live carelessly. The advocate is for the repentant, not for those who claim to know God yet disregard His commands.
For pastors & researchers
Greek interlinear, 8 commentaries & word study