We proclaim to you what we have seen and heard, so that you also may have fellowship with us. And our fellowship is with the Father and with his Son, Jesus Christ.

Light and Darkness, Sin and Forgiveness

This is the message we have heard from him and declare to you: God is light; in him there is no darkness at all.

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, purifies us from all sin.

If we claim we have not sinned, we make him out to be a liar and his word is not in us.

Love and Hatred for Fellow Believers

We know that we have come to know him if we keep his commands.

But if anyone obeys his word, love for God is truly made complete in them. This is how we know we are in him:

Anyone who loves their brother and sister lives in the light, and there is nothing in them to make them stumble.

But anyone who hates a brother or sister is in the darkness and walks around in the darkness. They do not know where they are going, because the darkness has blinded them.

Reasons for Writing

I am writing to you, dear children, because your sins have been forgiven on account of his name.

I write to you, dear children, because you know the Father. I write to you, fathers, because you know him who is from the beginning. I write to you, young men, because you are strong, and the word of God lives in you, and you have overcome the evil one.

On Not Loving the World

Do not love the world or anything in the world. If anyone loves the world, love for the Father is not in them.

The world and its desires pass away, but whoever does the will of God lives forever.

Warnings Against Denying the Son

Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour.

They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.

As for you, the anointing you received from him remains in you, and you do not need anyone to teach you. But as his anointing teaches you about all things and as that anointing is real, not counterfeit—just as it has taught you, remain in him.

God’s Children and Sin

And now, dear children, continue in him, so that when he appears we may be confident and unashamed before him at his coming.

See what great love the Father has lavished on us, that we should be called children of God! And that is what we are! The reason the world does not know us is that it did not know him.

Dear friends, now we are children of God, and what we will be has not yet been made known. But we know that when Christ appears, we shall be like him, for we shall see him as he is.

All who have this hope in him purify themselves, just as he is pure.

The one who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil’s work.

No one who is born of God will continue to sin, because God’s seed remains in them; they cannot go on sinning, because they have been born of God.

This is how we know who the children of God are and who the children of the devil are: Anyone who does not do what is right is not God’s child, nor is anyone who does not love their brother and sister.

Do not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own actions were evil and his brother’s were righteous.

This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers and sisters.

If anyone has material possessions and sees a brother or sister in need but has no pity on them, how can the love of God be in that person?