Plus these teachers claimed to be Christians, which would have been very troubling for the young churches to hear. Whom can they believe, and how can they evaluate new teachers as they come?

The author of 1 John has the answers. He knows the truth, and so he writes a letter to help the church know how to tell the children of God from the impostors. (Who is this author? The church has debated this for centuries, but traditionally it’s attributed to John, the son of Zebedee. We’ll call the author “John” for this article.)

John combats false teaching with absolutes: truth and lies, light and darkness, love and hate, sin and righteousness, Christ and antichrist. He shows the church how to tell if they are children of God and how to tell if a teacher is trying to deceive them.

This is a letter written from a wise and loving father to a troubled church. John writes to older men (“fathers”), young men, and children, but he addresses all of them as his “little children”—a term of endearment that a loving father would use for his child.

John’s letter moves around from theme to theme, but he makes three things very clear to the church:

1. The children of God believe in Jesus Christ
2. The children of God keep His commandments
3. The children of God love one another

And as far as John is concerned, the people he writes to are children of God (1 Jn 5:13).

Theme verse in 1 John

This is His commandment, that we believe in the name of His Son Jesus Christ, and love one another, just as He commanded us. (1 Jn 3:23)

1 John’s role in the Bible

First John is the fourth of the General Epistles (or Catholic Letters), the writings of apostles to the church at large. While Paul wrote to specific congregations and individuals, Peter, James, John, and Jude wrote to broader audiences scattered across the Roman empire. John’s next two letters, however, are written to specific audiences.

In addition to this one, John wrote two other New Testament letters, a Gospel, and possibly the prophetic book of Revelation. He was a leader in the early church, and he probably wrote his documents after most of the other New Testament books were already written.

First John is powerful. It’s also a bit odd. It reads somewhat like a letter, somewhat like a sermon, and a little like some passages from Proverbs. Most of our New Testament epistles begins with a formal greeting and end with a conclusion and instructions, but First John has neither of these characteristics.

Plus, John’s wise, fatherly writing style can wander from point to point: there are few obvious divisions in this letter. Plus, while many epistles contain a single statement of the author’s purpose in writing, John lists at least 12 reasons for penning this letter:

1. So that he and the church may have joy (1 Jn 1:4)
2. So that they would not sin (1 Jn 2:1)
3. Because their sins are forgiven (1 Jn 2:12)
4. Because they know God the Father (1 Jn 2:13)
5. Because they know Jesus (1 Jn 2:13)
6. Because they have overcome the evil one (1 Jn 2:13–14)
7. Because they are strong (1 Jn 2:14)
8. Because the word of God abides in them (1 Jn 2:14)
9. Because they know the truth (1 Jn 2:14)
10. Because no lie or false teaching can come from the truth (1 Jn 2:21)
11. Because some would try to deceive them (1 Jn 2:26)
12. So that they would know they have eternal life (1 Jn 5:13)

To be fair, these reasons are more fluidly interconnected in the text than a bulleted list like this makes them out to be.

First John’s role in the Bible is closely related to the Gospel of John. The Gospel of John is written to persuade non-Christians to believe in Jesus and find eternal life in His name (Jn 20:31). Conversely, the first letter of John is written so that those who believe in Jesus would know they have indeed found life in Him.

If you wonder how the teaching in First John played out in real life, you’ll love Second and Third John! These two very short letters apply First John’s general teachings of truth, love, and obedience to specific local church situations.

No other book of the Bible talks about love as often as First John. About one in every 50 words is a form of “love”—that makes for about 52 mentions of love in just five short chapters. And it’s no surprise: love is evidence of salvation (1 Jn 3:14), and John says that God Himself is love (1 Jn 4:8).

Quick outline of 1 John

Disclaimer: this may be the toughest book of the Bible to outline. With all John’s reasons to write, scholars have a hard time forming an outline from John’s letter. But the central focus of First John seems to be distinguishing the false teachers from children of God, so here’s my take:

1. The children of God keep His commands (1 Jn 1–3)
2. The Spirit of God affirms Jesus’ first coming (1 Jn 4:1–6)
3. The children of God love one another (1 Jn 4:7–21)
4. Things the child of God can know (1 Jn 5)

He’d told them about truth, love, and obedience—now he writes to tell them what to do about it.

In Second John, the elder (2 Jn 1) briefly explains the relationship between the three:

• Love and truth. John loves those who know the truth, because the truth “abides” in them (2 Jn 1–2). When two parties know the truth, love comes naturally.
• Truth and obedience. God the Father commanded that His children walk in truth (2 Jn 4). When you know the truth, obedience comes naturally.
• Obedience and love. The commandment that God gave isn’t anything new: “love one another” (2 Jn 5). A sure sign of obedience to God is love for His church, and a sure sign of love is obedience to God (2 Jn 6).

He then warns that “many deceivers have gone out into the world” (2 Jn 7), and that the Christians should watch themselves. They should beware of teachers who do not acknowledge Jesus’ human life and who deviate from the things He taught (2 Jn 8–9). Such people are dangerous: the church shouldn’t side with them, shouldn’t invite them in, and shouldn’t participate in their actions (2 Jn 10–11).

(Who is this elder? The church has debated this for centuries, but traditionally it’s attributed to John, the son of Zebedee. We’ll call the author “John” for this article.)

John is a bit cryptic in this letter, but he seems well aware of this. He would rather discuss this and more in person, so he lets the audience know that he hopes to visit soon (2 Jn 12).

Because truth, love, and obedience should be a part of everyday life, and the church needs to understand how.

Theme verse in 2 John

And this is love, that we walk according to His commandments. This is the commandment, just as you have heard from the beginning, that you should walk in it. (2 Jn 6)

2 John’s role in the Bible

In addition to this one, John is commonly credited with writing two other New Testament letters, a Gospel, and possibly the prophetic book of Revelation. He was a leader in the early church, and he probably wrote his documents after most of the other New Testament books were already written.

John writes this second letter to “the chosen lady and her children”—which may refer to a particular church leader, or perhaps metaphorically to a local church or group of churches. John refers to this lady’s “chosen sister” at the end of this letter (2 Jn 13), which may be code for a greeting from the children of another woman, or members of another church or group of churches.

Second John is the fourth of the General Epistles (or Catholic Letters), the writings of apostles to the church at large. While Paul wrote to specific congregations and individuals, Peter, James, John, and Jude wrote to broader audiences scattered across the Roman empire. Second and Third John, however, are written to specific audiences.

Second John is the second shortest book of the Bible—Third John is the shortest (by word count). It’s only one chapter long, and has only thirteen verses.

This letter repeats many themes from John’s first letter, and Third John reflects these themes as well. Overall, the three letters from John give us an idea of what the apostle thought was most important at the time: sound teaching, obedience to God, and brotherly love.

Quick outline of 2 John

1. Walk in truth (1–4)
2. Love others and obey God (5–6)
3. Beware false teachers (7–11)
4. Look forward to a visit (12–13)

From Overview Bible