So in both cases I think your original point of reasoning - that prolepsis must be pre-rational and is never a "conclusion"- is the way forward. That original point just needs to be followed to its logical conclusion so that we rigorously separate the faculty of prolepsis from including "conclusions" or "ideas" of any kind.
Thanks Cassius That's exactly where I struggle with regarding epicurean prolepsis of gods and I can't find any arguments that would justify Epicurus' claims. When you say this:
Regardless of whether you pursue the "real" or "ideal" view of gods, the prolepsis that Velleius is talking about need not be anything more than the selective pattern-recognition of "blessed/happy" and "deathlessness." After those patterns are realized as applicable to life here, other observations about living beings here, that nature never makes a single thing of a kind, that the universe is eternal and filled with life, etc, would be enough to extend the concept through conceptual reasoning to conclude that such beings do in fact exist somewhere in the universe.
I instantaneously say: There are no patterns for blessedness and deathlessness in nature that living beings are exposed to. These are concepts, ideas or conclusions humans can reason out but these concepts are not of proleptic nature. They are creations of reason ie. we have patterns for death and reasoning powers to comprehend the concept of the opposite. That's why we can comprehend deathlessness. Not because we are exposed to it but because we can create this complex concept (correctly or incorrectly) in our minds by the power of our minds and not by any criteria of truth. And that brings me back to square one.