I grasp "for him"---at least I think I do though we don't know what we don't know. There are no doubt hidden depths there I have not plumed as he is so multifaceted.
And I understand the concept as Sproul described it of "fills all things". But I cannot grasp it as to practical application. I do not even know how to say what I mean by that. It seems like it should affect me in some profound knee buckling way. It is as though there is something about Jesus I do not yet get. And I think it goes back to the mystery of the Trinity. So maybe ungraspable with my finite mind. I know the three "persons" of the Trinity are one God but distinct but my mind, in prayer, speaks with them individually. I don't know how to merge (mental picture) Jesus and the Father. I either commune with the Father or Jesus or the Holy Spirit.
Maybe this will express my inability to grasp "fills all things". What does it matter, or how should it matter, that Christ fills my dining room table?