Alessandro Ferrara - In Philosophy Pluralism Rhymes with Public Reason

In Plato’s metaphor of the cave, a philosopher leaves the cave and brings back news from the world outside. A single fugitive can bring one truth, but several fugitive-philosophers would bring back diverse accounts. None of them can be proven the one unquestionably true account of what is outside the cave. That authority in the cave rules legitimately when confined to the area of overlapping of these accounts: that is what John Rawls calls “public reason”.
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Venice 2018

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Does this explanation stem from Ferrara's own work?