Convivio

One is, as I've already hinted, this explanation or her discourse here is quite cryptic.

It's cryptic unless you've read all of Paradiso or a fair amount of background source material, including Dante's own unfinished Convivio.

Now, this is a question here about how an average reader, even in the Middle Ages, would would have read his Convivio or would have read some of this background source material.

Some of it, like Boethius, is pretty approachable.

Some of it is pretty abstruse and pretty archaically odd.