Summary: God’s realm includes the physical world we live in, but it is much more that we can’t see. To understand what it means to live in God’s house, Paul uses different metaphors to show us what we can’t see.
My Father’s house has many rooms; if that were not so, would I have told you that I am going there to prepare a place for you? And if I go and prepare a place for you, I will come back and take you to be with me that you also may be where I am.
Jewish tradition holds that a young man would have to build a home for his bride before they could be married. Typically the home was added on to the family home of his father’s. When the father declared the new addition to be ready, then the son could go and take his bride to be with him in their new home.
Jesus uses this tradition as an analogy for where he is going and what he is doing. He wants us to be with him in heaven so he prepares a place for us in his Father’s house.
Here again, we see Jesus telling us about this place he is from. Clearly, he is not from around here. He is just visiting the earth and when he leaves he is going where we cannot go. (John 13: 33) The good news is that we can follow later. (John 13: 36)