Known and understood are different things. One analogy of God's unknowability that I heard was how you can't taste your tongue. It tastes other things with its tastebuds, that's it's function, so it cannot have a taste unto itself. Anything it tastes is something else. Yet we can understand the tongue that tastes yet has no taste.
Our minds comprehend, that's what they do. Like the tongue that cannot taste itself, awareness cannot be aware of itself, because awareness is of other things, all the things of the world. The thought (consciousness) that is awareness of the world is a continuum of "now," right now. It is an unbroken stream of world, and we are immersed in that world of thought.
Mind also makes (what we call) 'thoughts' by chopping up that continuum. Mind (in contrast to consciousness) exists to analyse, to organize, and to make sense of the continuum of thought. It isolates a bit of the continuum--identifies it, names it, classifies it, stores it in memory, recalls it, compares it to other 'thoughts'--and we think we've "captured" a real bit of the world. But like a taste on the tongue that cannot taste itself, all that's really been captured is "a thought" about the world.
God is that continuum. It is the thought that is the world, and it is also in every way a 'thought' captured and named "God."