And this is how we know [daily, by experience] that we have come to know Him [to understand Him and be more deeply acquainted with Him]: if we habitually keep [focused on His precepts and obey] His commandments (teachings).

But whoever keeps His word, truly in him the love of God is perfected. This is how we know we are in Him:

He that saith how that he is in the light, and yet hateth his brother, is in darkness even until this time.

Babes, I write unto you how that your sins are forgiven you for his name's sake.

I write unto you fathers, how that ye have known him that was from the beginning. I write unto you young men, how that ye have overcome the wicked. I write unto you young children, how that ye know the father.

I write unto you fathers, how that ye have known him that was from the beginning. I write unto you young men, how that ye be strong; and the word of God dwelleth in you, that ye have overcome the wicked.

Little children, it is the last hour. Just as you heard that an antichrist is coming, so now many antichrists have appeared. This is how we know it is the last hour.

I wrote not unto you, as though ye knew not the truth: but as unto them them that know it, and know also how that no lie cometh of truth.

Look at how great a love the Father has given us that we should be called God’s children. And we are! The reason the world does not know us is that it didn’t know Him.

This is how God’s children—and the Devil’s children—are made evident.

Whoever does not do what is right is not of God, especially the one who does not love his brother.

This is how we have come to know love: He laid down His life for us. We should also lay down our lives for our brothers.

But whoso hath this world's good, and seeth his brother have need, and shutteth up his bowels of compassion from him, how dwelleth the love of God in him?

This is how we will know we belong to the truth and will convince our conscience in His presence,

The person who keeps his commandments abides in God, and God abides in him. This is how we can be sure that he remains in us: he has given us his Spirit.

This is how you know the Spirit of God: Every spirit who confesses that Jesus Christ has come in the flesh is from God.

And every spirit that confesseth not that Jesus Christ is come in the flesh, is not of God. And the same is that spirit of antichrist, of whom ye have heard, how that he should come: and even now already is he in the world.

We belong to God. The person who knows God listens to us. Whoever does not belong to God does not listen to us. This is how we know the Spirit of truth and the spirit of deceit.

This is how God's love was revealed among us: God sent his unique Son into the world so that we might live through him.

This is how we know that we remain in Him and He in us: He has given assurance to us from His Spirit.

This is how love has been perfected among us: we will have confidence on the day of judgment because, during our time in this world, we are just like him.

If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?

This is how we know that we love God’s children when we love God and obey His commands.

For whoever [Note: The Greek says "whatever"] is [spiritually] conceived [and eventually born] by God will overcome [the evil influence of] the world. And this is [how] that victory can be gained over the world: [It is through] our faith [in God].

And this is the witness: how that God hath given unto us eternal life, and this life is in his son.

These things have I written unto you that believe in the name of the son of God, that ye may know how that ye have everlasting life, and that ye may believe in the name of the son of God.

And this is [how we can express] boldness in our relationship with God: Whatever we ask [of God, in prayer], so long as it is in harmony with His will for us, [we know] He hears our request.