one principle, one spiration
In my gift-ontology, “one principle, one spiration” is the doctrinal control-phrase that forbids reading the Filioque as introducing two sources of the Spirit. It states that the Spirit’s origin is not from two independent principles and not by two spirations, but from Father and Son as one principle with one spiration. The key metaphysical point is simplicity: if divine life is one simple act, there cannot be two independent spirating sources. The key personal point is monarchy: the Son’s involvement must be understood as belonging to the Son’s being-from the Father, not as an additional arche alongside the Father. This phrase therefore belongs in the dictionary as a guardrail term, not as decorative ecumenical language.