Jonathan Orme’s Reviews > The Problem of Pain > Status Update

This sentence is breaking my brain and I can't let it go. I feel like I get the gist of what it's trying to say but I just cannot parse the grammar correctly.

"He is further from us because the sheer difference between that which has Its principle of being in Itself and that to which being is communicated is one compared with which the difference between an archangel and a worm is quite insignificant."