Relatio Subsistens
Ipsum Esse Subsistens, or so Aquinas says.
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It’s become a famous phrase in theology: “Ipsum Esse Subsistens” (God is the Subsistent Act of Being itself), which describes God as the pure act of existence, the ultimate and most fundamental reality. In the Relational Essence (RE) theory, an equivalent phrase, according to ChatGPT, would be “Relatio Subsistens,” where relationality is the ultimate foundational and subsistent reality. If the RE theory were to be successful, it would focus on relationality as the core of existence and highlight the dynamic and mutual indwelling nature of the Trinity as the terms for metaphysically explaining everything in this fundamental sense, albeit metaphysically, via a relational ontology rather than a substance-based one like Aquinas.