If you love Me, keep My commandments. And I will pray the Father, and He will give you another Helper, that He may abide with you forever--the Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you.
Jesus was telling His disciples they will not be left without a part of Him remaining with them in the power of the Holy Spirit. He had to leave them (die) for this to occur. I'm certain this is how we come by faith to Christ since we can no longer see Him physically face to face. Remember, God, Jesus and the Holy Spirit are one.
When I came to Christ it was first through the power of the Holy Spirit that caused me to realize a need. When I acknowledged that need and called on the name of the Lord, I was then filled with the Holy Spirit. It only happens when we receive Christ into our hearts.
Then, as little marginal notes written in my Bible state, the Holy Spirit becomes our teacher, counselor, comforter, truth. It's a promise that God said we would receive to have a better understanding of Jesus' truths which are in the Bible.
If we do not hold to all that the Bible says, if we don't agree with everything, we do not have the Holy Spirit. It's that simple. Am I convicted because of some of the things written? Yes. Because I know there are times I don't want to hear something. I admit it. It doesn't mean I don't agree; it's an area that still needs work on...also through the power of the Holy Spirit...and my submission.
Jesus says in His own words, the Spirit of truth, whom the world cannot receive...because some in the world do not know Jesus in the way He requires. And the Spirit does not live in them. These are hard words. They will offend.
What does Jesus require? Most assuredly*, I say to you, unless one is born again, he cannot see the kingdom of God. Most assuredly*, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. That which is born of the flesh is flesh, and that which is born of the Spirit is spirit. Do not marvel that I said this to you, 'You must be born again.'" (John 3:3,5-7)
Oh there she goes with that born again stuff! No...there He goes with those words. If it were not true, Jesus would not have said it. Being born of water...and Spirit. It is through the washing of rebirth and renewal by the Holy Spirit (Titus 3:5). 1Corinthians 5:50 says that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable. It's a spiritual thing, which is imperishable. Flesh is perishable, spirit is not. Our spirits will live either in the kingdom of God or in hell.
With the help of the Spirit of God truth is revealed. All that the Bible claims will come alive. Things that would have offended one will now be understood...or should be. I've heard of even some believers not believing every word in the Bible. That's the enemy deceiving, spreading lies.
When one becomes born again and receives the Spirit of truth, it means He dwells in you and will be with you.
... He who knows God hears us; he who is not of God does not hear us. (1John 4:6) It's pretty plain:
Romans 8:9-11 - But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His. And if Christ is in you, the body is dead because of sin, but the Spirit is life because of righteousness. But if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ from the dead will also give life to your mortal bodies through His Spirit who dwells in you.
*of a truth, so be it, amen