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Nor is He a composite formed from parts.
A composite exists as a whole through constituent elements standing in a determinate relation. Its structure presupposes both the elements and their arrangement.
If the necessary being were composite, its parts would have to be either necessary or contingent, and their specific arrangement would require explanation. Dependence on contingent constituents contradicts necessary self-subsistence, while multiple independently necessary parts conflict with established unity.
Conclusion: Divine oneness is not the oneness of a whole assembled from separate pieces. Composition introduces a kind of dependence.