It's like, when I think how holy God is, then I'm trying to look around and compare that to anything else, I'm struck by how unholy most of the world is. Wait, "unholy" gives the wrong meaning. Not "unholy" - more just, non-holy. I mean what else besides God even is holy? "Thou" is pretty holy.
"Thou" seems to have become the benchmark, in a lot of ways, for holiness. I think we can all pretty much agree God's holier than that! But what else even is there?
I guess that's part of the mystery of holiness.