1 John 4:13

However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him.

And by this we know that we have come to know Him, if we keep His commandments.

but whoever keeps His word, truly in him the love of God has been perfected. By this we know that we are in Him:

And the one who keeps His commandments abides in Him, and He in him. We know by this that He abides in us, by the Spirit whom He gave us.

And we have come to know and have believed the love which God has in us. God is love, and the one who abides in love abides in God, and God abides in him.