One may consider the following to be a puzzling perplexity: How then is it that the Holy Spirit (who, as the Bible says, is the God who created all things) can “fit” inside the human heart, anyway? Just exactly how “big” is this Holy Spirit, anyway?
Some facts to consider:
1. He is the God who created the universe. In this sense, he is by far “larger” than the universe itself;
2. When he comes to live inside a human being, he does not partially come inside as if only a part of him were there; but rather he is there is his entirety, yet, perhaps, without expression. Here is what I mean by expression: He cannot express himself in the person who grieves (suppresses) him; God cannot “do as he wishes” in the heart where he is being limited. This is what it means to “grieve” or “quench” the Holy Spirit. “Quench not the Spirit.” (1 Thessalonians 5:19)
So God comes inside in his entirety. It is not “half of God” that has come to live inside of us, when we become believers; but rather, it is all of God – he is there in his completeness, in his fullness, in all his glory, and all his splendor.
But if he, the God who created all things, who is much larger than his creation, has come to live inside of us, his creation, who is but small by comparison, and, if he has indeed come to live inside of us in his entirety (he is all there, none of him is missing), then how is it, really, that he can do this, and does it really make sense that he could actually come to live inside of mere human beings? “What is man, that thou art mindful of him?” (Psalm 8:4a) Yet God does do it — he lives inside those with whom he is reconciled! (Praise God!)
What then of demonization? Do we offend God by saying that a demon can live inside the same heart in which the Holy Spirit has come to dwell? But again, I bring you back to the time and space issue, which I believe is a hard, but nevertheless quite important topic to handle in dealing with such an issue as this. The issue here is that ‘time’ and ‘space’ in the spiritual (eternal) sense are much differently comprehended and explained than they are in the temporal (limited) sense.
The fact that a demon can come live “inside” the same heart in which the Holy Spirit resides is understood when we properly come to grips with what this concept of time and space is all about — that is, in the eternal realm.
To say that the God who created the universe came to dwell in that universe (in the form of Jesus Christ) does not make sense from a temporal (limited) sense. To say that this same God indwells believers make even less sense.
Do we then argue that a demon cannot dwell inside a person who has received the Holy Spirit, when in fact we cannot even perceive in the first place how the Holy Spirit himself could possibly dwell inside a human being? Do we then offend God by saying that a demon can live inside one “compartment” of the human heart whilst at one and the same time the Holy Spirit lives inside another “compartment” of that same human heart?
God forbid that we should offend God by saying that the Holy Spirit and a demon could occupy nearly (but not exactly) the same physical region, but then again, what do you make of the fact that the eternal Son of God came to visit this sin filled, demon filled, earth in which we do now live?