The point here is that mankind, made in the image of God, has a certain triune nature. We have three distinct, identifiable 'parts' that individually stand on their own yet in concert make one unique being.
So it is not as though a triune Creator is an unnatural, totally alien notion.
So it is not as though a triune Creator is an unnatural, totally alien notion.
John 14/15/16 Jesus Himself explains;
1. The advocate was there with the disciples and they knew Him
2. Jesus still had to go for the advocate to come in them (disciples)
3. Jesus does not leave them comfortless but promises to come to them shortly
Jesus here was not talking of two parts or two distinct persons of one being. Jesus was talking about Himself; He was there with them and they knew Him, yet had to go and come in a different for to indwell them.