** Grace operator Ĝ ≡ external operator capable of σ: -1 → +1.
We're not reducing grace—we're formalizing it. An operator is a mapping that transforms states. Grace transforms moral states. The operator formalism captures what grace does without claiming to exhaust what grace is. God can work through mathematical structure just as He works through natural law. Formalization enables precision; it doesn't eliminate mystery.
"External" means external to the individual's closed moral system—the set of operations the agent can generate through their own will and resources. God is omnipresent but His saving action comes from outside the sinner's self-enclosed system. A drowning person is surrounded by water (omnipresent), but the lifeline comes from outside their position. Grace is external to the self, not external to reality.
The grace operator Ĝ requires [[065_BC8_Voluntary-Coupling|voluntary coupling]] ([[065_BC8_Voluntary-Coupling|BC8]]). It's not mechanical application but relational response. The operator formalism describes what happens mathematically when grace transforms a soul, but the how involves personal relationship, faith, trust. Mechanism ≠ impersonal. The heart's operation is mechanical (pump); love that flows through it is not.
Ĝ is specifically the saving grace operator. Apostasy (fall from grace) involves different dynamics—typically, withdrawal of voluntary coupling, allowing decoherence back toward the -1 attractor. The operator is asymmetric because salvation and damnation are not symmetric processes. Grace lifts; sin gravitates. Ĝ captures the lifting operation. Falling is not Ĝ⁻¹; it's the absence of Ĝ.
Souls have a quantum description ([[087_E10.1_Soul-Field-Equation|E10.1]]: the Klein-Gordon [[084_D10.1_Soul-Field-Psi_S|soul field]]). The soul's state includes a sign component in the moral Hilbert space H_moral. Ĝ acts on this component. The soul is not "just" a vector—it's a field configuration—but it has a projection onto the sign space where Ĝ operates. The operator formalism is applicable because the soul has mathematical structure.
The grace operator in the sign basis {|+⟩, |-⟩}:
Action:
Verification of non-unitarity:
Grace is non-unitary, as required by [[074_A9.2_Non-Unitarity-Of-Grace|A9.2]].
Definition ([[075_D9.1_Grace-Operator-Definition|D9.1]]): The grace operator Ĝ is defined as the unique linear operator on the moral Hilbert space H_moral = span{|+⟩, |-⟩} such that:
1. Ĝ|-⟩ = |+⟩ (sign-flip for opposed state)
2. Ĝ|+⟩ = |+⟩ (preservation of aligned state)
3. Ĝ is external to the self-operation algebra of any finite agent