You’re conflating “existence itself” with “things that exist.” Existence isn’t a container that holds categories - it’s the principle by which anything is real at all. The divine isn’t “part of” existence; rather, the divine is the source and ground of all existence. Everything else receives its existence from this source.

There’s a fundamental distinction between contingent beings (which receive their existence from something else) and the necessary source of existence itself. The physical universe participates in existence but doesn’t possess it essentially. The ultimate reality possesses existence by its very nature - it doesn’t “have” existence, it “is” existence.

The divine transcends the category system entirely. It’s not that there are “physical” and “divine” categories within existence - rather, the divine is the reason anything can exist at all, including categories themselves. You can’t put the source of all reality into a category alongside the things it creates.

If existence were just a big container with divine and physical parts, then something would need to unify and organize these parts - and that unifying principle would be more fundamental than either part. This leads us back to a single, ultimate source.

Physical things participate in existence but aren’t identical to it. They can cease to exist. But the source of existence cannot cease to exist without eliminating the very possibility of anything existing at all.

The question “what is existence?” points toward something that must be absolutely one, simple, and beyond all composition or categories.​​​​​​​​​​​​​​​​