The Assurance of His Abiding Love 1 John 4:13
John says that we can "know that we abide in Him" (God) and that "He is in us" on the basis of the fact that "He has given us of His Spirit."
Notice carefully that it doesn’t merely say He has given us His Spirit but that He has given us "OF His Spirit." Literally this translates "out of His Spirit." When we love as God loves we are drawing on the resources of the Holy Spirit.
Rom. 5:5 tells us "…the love of God has been poured out in our hearts by the Holy Spirit who was given to us." When you became a Christian the Holy Spirit came to permanently reside within you. That’s what v.13 means by "He in us." He "poured out" God’s love in you so that you have all the resources you need to love as God loves.
How do we know that "we abide in Him and He in us?" We know or understand this by the discernible presence of the Spirit; we can sense the work of the Holy Spirit in our lives. We can hear His still, small voice in our hearts. We sense His conviction, encouragement and direction.
Scripture goes on to say that “God is Love” (v16) and “whoever lives in love lives in God, and God in him.” Are you loving and giving love like God?