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Fabius actually seems a little irrational in this quote. At first he objects to Augustus's interpretation because Augustus is not an expert on the interpretation of signs, which is reasonable. But then when Augustus does have an intepretation that's coming from an augur, Fabius still continues to question it, pitting his view against expert opinion like it was still just the opinion of Augustus. Since it is not established that Fabius would be an augur himself, this seems like motivated cognition / not properly updating on evidence.
Alternatively, it could ...
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