“Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit.”
King James Version (KJV)
4:12 If we love one another, God abideth in us - This is treated of, #1John 4:13 |- 16. And his love is perfected - Has its full effect. In us - This is treated of, #1John 4:17 |- 19.
4:14 And in consequence of this we have seen and testify that the Father sent the Son - These are the foundation and the criteria of our abiding in God and God in us, the communion of the Spirit, and the confession of the Son.
4:15 Whosoever shall, from a principle of loving faith, openly confess in the face of all opposition and danger, that Jesus is the Son of God, God abideth in him.
1Jo 4:13 Hereby know we that we dwell in him, and he in us. We know that God dwells in us by the Spirit given us. because he hath given us of his Spirit. But we know we have the Spirit by its fruits. The first and greatest of these is love. See Ga 5:22.