This is relational language. The word he uses here is the same word that will be used for abiding later and is intended to communicate that untroubled hearts come from being in a relationship with Jesus Christ. Some have tried to describe the flora and fauna of heaven, such as streets paved with gold. I think this is the most sublime definition of heaven we have from any source in all world literature. Life is relational.
Nothing matters more than who is there.
He is there. This is the most comforting word for us when we face life's deepest troubles in our own death or in the death of our loved ones. It not only tells us that this is not the only world and this is not the only life, but that the life that is to come is going to surpass the life that we have here. He is like a lot of concrete sequential thinkers. All this talk of mansions and rooms and goings and comings doesn t cut it for him.