The marks of new birth — the tests of 1 John¶

First John is the Bible's most sustained essay on assurance. It was written "that you may know that you have eternal life" (5:13). But it is also a letter full of tests. John gives his readers marks by which they can examine themselves, and he does not apologize for it.

The tests are not a checklist for earning salvation. They are the family likeness of the born-again. A child resembles a parent not because the child works at it, but because the child shares the parent's life. The marks are evidence of the life, not the price of it.

The purpose of the letter¶

"I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life." (1 John 5:13)

"I write these things to you about those who are trying to deceive you." (1 John 2:26)

"Little children, let no one deceive you. Whoever practices righteousness is righteous, as he is righteous." (1 John 3:7)

John writes to give assurance and to expose deception. The same letter that says "you may know" says "let no one deceive you." Assurance is not gullibility. It is confidence grounded in the truth, including the truth about ourselves.

The tests¶

1. Walking in the light, not in darkness¶

"If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin." (1:6-7)

"If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness." (1:9)

The first test is honesty. The person who walks in the light does not pretend to be sinless (1:8, 10). He confesses. He agrees with God about his sin. He does not hide in the dark.

This is not a test of perfection. It is a test of truthfulness. A believer may fall, but he does not deny that he has fallen. A person who says "I have no sin" is not walking in the light.

2. Keeping the commandments¶

"And by this we know that we have come to know him, if we keep his commandments. Whoever says 'I know him' but does not keep his commandments is a liar, and the truth is not in him, but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him: whoever says he abides in him ought to walk in the same way in which he walked." (2:3-6)

The second test is obedience. Not sinless obedience, but a life that is oriented toward keeping the commandments. The person who claims to know God and lives in habitual disobedience is contradicted by his life.

John is not teaching salvation by works. He is teaching that the life of God produces a certain kind of life. "Whoever practices righteousness is righteous, as he is righteous" (3:7). The practice is the evidence, not the cause.

3. Loving the brothers¶

"Whoever says he is in the light and hates his brother is still in darkness. Whoever loves his brother abides in the light, and in him there is no cause for stumbling." (2:9-10)

"We know that we have passed out of death into life, because we love the brothers. Whoever does not love abides in death." (3:14)

"If anyone has the world's goods and sees his brother in need, yet closes his heart against him, how does God's love abide in him? Little children, let us not love in word or talk but in deed and in truth." (3:17-18)

The third test is love. Not a warm feeling, but concrete self-giving. John is brutally practical: if you have resources and see a brother in need and do nothing, the love of God is not abiding in you.

This is the test that most directly connects to John 15. The branch that abides in the vine bears the fruit of love. A professing Christian who consistently refuses to love the brothers is a branch that is not bearing the fruit of the vine.

4. Not loving the world¶

"Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world — the desires of the flesh and the desires of the eyes and pride of life — is not from the Father but is from the world." (2:15-16)

The fourth test is allegiance. The world here is not the physical creation; it is the system of desire and pride that is opposed to the Father. A person can be in the world without loving it. But a person who loves the world cannot love the Father.

This is not a call to monastic withdrawal. It is a call to examine what we actually treasure. The person whose heart is set on the world's approval, comfort, and possessions is not abiding in the love of the Father.

5. Confessing Christ¶

"Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son. No one who denies the Son has the Father. Whoever confesses the Son has the Father also." (2:22-23)

"By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, and every spirit that does not confess Jesus is not from God." (4:2-3)

"Everyone who believes that Jesus is the Christ has been born of God." (5:1)

The fifth test is confession. The person who is born of God confesses that Jesus is the Christ, the Son of God, come in the flesh. This is not merely intellectual agreement; it is the public, lived confession of faith.

The false teachers in 1 John were denying that Jesus was the Christ and that he had come in the flesh. John says their denial showed they were not of God. Doctrine matters, because it is the doctrine of the person of Christ.

6. Practicing righteousness, not sin¶

"If you know that he is righteous, you may be sure that everyone who practices righteousness has been born of him." (2:29)

"No one born of God makes a practice of sinning, for God's seed abides in him, and he cannot keep on sinning because he has been born of God. By this it is evident who are the children of God, and who are the children of the devil: whoever does not practice righteousness is not of God, nor is the one who does not love his brother." (3:9-10)

The sixth test is the direction of the life. The Greek present tense is habitual: "makes a practice of sinning." The born-again person does not live in sin as a settled pattern. He may fall, but he does not make peace with the fall.

This is not sinless perfection. It is a change of master. "No one born of God makes a practice of sinning" does not mean "no one born of God ever sins." It means that sin is no longer the ruling pattern of the life.

7. The Spirit's anointing and witness¶

"But you have been anointed by the Holy One, and you all have knowledge." (2:20)

"And the anointing that you received from him abides in you, and you have no need that anyone should teach you. But as his anointing teaches you about everything, and is true, and is no lie — just as it has taught you, abide in him." (2:27)

"By this we know that he abides in us, by the Spirit whom he has given us." (3:24)

"By this we know that we abide in him and he in us, because he has given us of his Spirit." (4:13)

The seventh test is the Spirit's witness. The Spirit teaches, assures, and produces the family likeness. This is not a private voice that contradicts Scripture; it is the Spirit who inspired Scripture, teaching the believer to understand and love it.

The Spirit's witness is not independent of the other tests. The same Spirit who says "Abba, Father" (Rom 8:15) produces love, obedience, and confession. If someone claims the Spirit's witness while denying Christ or living in hatred, the claim is false.

8. Hope and purity¶

"Beloved, we are God's children now, and what we will be has not yet appeared; but we know that when he appears we shall be like him, because we shall see him as he is. And everyone who thus hopes in him purifies himself as he is pure." (3:2-3)

The eighth test is hope. The person who hopes to see Christ purifies himself. The hope is not a passive waiting; it is an active longing that changes how we live.

9. Overcoming the world¶

"For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world — our faith. Who is it that overcomes the world except the one who believes that Jesus is the Son of God?" (5:4-5)

The ninth test is persevering faith. The one who is born of God overcomes the world by faith. This is not a one-time victory; it is the ongoing victory of trust in Christ.

How to use the tests¶

The tests are diagnostic, not curative. They tell you what the life looks like; they do not produce the life. If you are worried about your salvation, do not use the tests as a ladder to climb. Use them as a mirror:

Do I confess my sin, or do I deny it?
Is there a direction of obedience in my life, even if it is imperfect?
Do I love the brothers, in deed and truth?
What do I actually love — the Father or the world?
Do I confess Christ, or am I drifting from him?
Is sin my settled practice, or is it my grief?
Do I know the Spirit's witness, and does it produce the family likeness?
What am I hoping for?
Am I still believing, still overcoming?

If the answers are mixed — and they usually are — do not despair. The tests are not all-or-nothing. They are meant to show you where the life is and where it needs to grow. The answer to a failing test is not "try harder to be saved"; it is "turn back to Christ and abide."

The comfort of the tests¶

The tests are not a threat; they are a gift. They tell the believer, "This is what the life looks like. You are not crazy to want assurance. Here is where to look." They also tell the deceiver, "This is what the life looks like. You cannot claim the name and live in the darkness."

The letter ends with a confidence that is not arrogant:

"And this is the confidence that we have toward him, that if we ask anything according to his will he hears us." (5:14)

"We know that we are from God, and the whole world lies in the power of the evil one." (5:19)

"Little children, keep yourselves from idols." (5:21)

The tests lead to confidence, and confidence leads to watchfulness. That is the biblical balance.