Claim. Anything that exists eternally must move in a circle, because straight-line motion cannot be sustained forever — and circular motion requires give-and-take between a subject partner and an object partner. Therefore even God must have dual characteristics to live eternally.
Elaboration. Per 2.6. The Reason All Beings Are Composed of Dual Characteristics: “For any being to exist, energy is required, and energy can be produced only through give and take action. However, nothing can reciprocate without a partner. To generate the forces necessary for existence, a being must contain dual characteristics, a subject partner and an object partner, which can engage in give and take action.”
The eternity argument: “A movement in a straight line cannot be sustained forever. For anything to have an eternal nature it must move in a circle; give and take action between a subject partner and an object partner is necessary for any circular motion. This is true even for God; having dual characteristics allows Him to live eternally. In order for God’s creation to resemble His eternal nature and be His eternal object partner, it likewise must be composed of dual characteristics. Similarly, time maintains its perpetuity through its periodic cycles” (ibid).
This is DP’s deepest metaphysical argument for why God must be structurally dual rather than simple: eternal life requires self-sustained energy generation; energy comes only from give-and-take; give-and-take requires duality. Classical theism’s “simple God” cannot, on this reasoning, be eternal in the strict sense — only a God whose inner being already engages in subject-object give-and-take has the resources for eternity. The argument runs in the opposite direction from cosmological proofs: it derives God’s structure not from contingency of creation but from the necessary conditions of eternal being itself.