The only unoriginate and endless divine procession is the Trinity's internal generation and spiration
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Procopius opens his refutation of Proclus's chapter 140 by defining the one divine procession that is without beginning and without end.
The only divine procession that could be called unoriginate and endless is the generation of the one and only Son from the one and only Father, and from the same Father the projection of the one and only Holy Spirit.In this procession the Father's single source, which is paternal and ruling, or rather pre-unoriginate, moved into the pair seen in the Son and the Spirit, and came to rest at the Trinity, as our Theologian Gregory says.
Greek
Refutatio Procli (fragmentum e cod. Vat. gr. 1096)