12. No man has at any time [yet] seen God. But if we love one another, God abides (lives and remains) in us and His love (that love which is essentially His) is brought to completion (to its full maturity, runs its full course, is perfected) in us!
13. By this we come to know (perceive, recognize, and understand) that we abide (live and remain) in Him and He in us: because He has given (imparted) to us of His [Holy] Spirit.
14. And [besides] we ourselves have seen (have deliberately and steadfastly contemplated) and bear witness that the Father has sent the Son [as the] Savior of the world.
15. Anyone who confesses (acknowledges, owns) that Jesus is the Son of God, God abides (lives, makes His home) in him and he [abides, lives, makes his home] in God.