What Does it Mean when it is said that ‘the Holy Spirit is in you?’
It means God Himself now permanently lives in His people. The presence that once filled the temple now dwells in every believer (1 Corinthians 6:19). It is not a feeling or a second experience to chase, but a change of relationship — God is now your Father, savingly and forever. You did not install Him and you cannot dislodge Him.
For most of the Old Testament, the presence of God had an address. If you wanted to draw near to Him, you travelled — first to a tent pitched in the wilderness, later to a stone temple in Jerusalem. God was not confined there, but that was the place He had appointed to meet with His people, and it was one place, in one city, belonging to one nation.
Then Paul wrote to a church in Corinth — dockworkers, slaves, former idol-worshippers, people with recent and public sins — and told them something that would have sounded impossible a generation earlier:
1 Corinthians 6:19 (NKJV)
Or do you not know that your body is the temple of the Holy Spirit who is in you, whom you have from God, and you are not your own?
That is the answer in its shortest form. The presence that once filled a building now lives in people. When Christians say the Holy Spirit is in you, they are not using a warm figure of speech about feeling close to God. They mean that God Himself has taken up residence in His people, and that the ordinary believer is now the place where He dwells.
This needs one clarification immediately, or it will be badly misunderstood. God is already everywhere. There is nowhere He is absent and no space He needs to be admitted into. So “in you” cannot mean that God has travelled somewhere He had not previously reached. Scripture is not describing a change of location; it is describing a change of relationship. God is present to every person as Creator and as Judge. He is present in His people as Father — savingly, personally, and permanently. What is new is not how near He is. What is new is what He is to you.
Jesus promised this on the night He was betrayed, speaking to men who were hours away from losing Him.
John 14:16–18 (NKJV)
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. I will not leave you orphans; I will come to you.
Three words in that promise carry the weight. The first is Helper. The Greek word is parakletos, which means someone called to your side — an advocate who stands with you, not a feeling that comes over you. Older translations render it Comforter or Counsellor, and all of them are reaching for the same idea: a person, present with you, on your side.
The second word is forever. The Spirit was given to abide, not to visit. In the Old Testament the Spirit came upon particular people for particular tasks and could depart from them, which is why David prayed that God would not take His Holy Spirit from him. That is not the arrangement Jesus describes. Scripture warns that a Christian can grieve the Spirit by his sin, and that warning is serious — but it never says the Spirit is evicted by it. A believer having a terrible week is not a believer who has been vacated. This is why indwelling is not something you sustain by your performance. You did not install Him and you cannot dislodge Him.
The third phrase is the world cannot receive Him. Not will not — cannot. That single word settles the question of how any of this begins. A man in his natural state is unable to receive the Spirit, which means nobody negotiates his way into this by an act of his own will. The Spirit did not wait outside until you decided in His favour. He came to a person who could not have received Him and gave him the life that made faith possible; and since then He has not left. You did not believe and then earn Him. He gave you the ability to believe.
That also means there is no such thing as a Christian who does not yet have the Spirit. Paul puts it flatly:
Romans 8:9 (NKJV)
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.
There are not two tiers of believer, the ordinary ones and the Spirit-filled ones. Indwelling is not a second experience to be sought after conversion, and any teaching that presents it that way leaves genuine Christians hunting for something they already possess. If you belong to Christ, He dwells in you. If He does not dwell in you, you do not belong to Christ. There is no third category.
Which is why Paul finished that sentence to the Corinthians the way he did: and you are not your own. The building already has an occupant, and what you do with your body is now His business, because your body is His.