Without simplicity, God must be dependent on something other than His divinity for some aspects of His being, and thus He cannot be a se and independent. Without simplicity, God is open to the acquisition of being in addition to His essence and thus is not immutable. Without simplicity, it is not clear why God could not experience temporal change and thus fail to be timelessly eternal. Without simplicity, it is impossible that God be in every way infinite as there must be parts in Him, and parts by definition must be finite.
