Chaucer Does the Work for Me (lines 29-35)

This bok of which I make of mencioun,
Entitled was al thus, as I shal telle,
Tullius of the dreme of Scipioun.
Chapitres seven hit hadde, of hevene and helle,
And erthe, and soules that therinne dwelle,
Of whiche, as shortly as I can hit trete,
Of his sentence I wol you seyn the grete.

Chaucer didn't have the internet, so he couldn't use google to find the text of the "Dream of Scipion" section of Cicero's Republic. Instead of reading a classical work like Cicero directly, he only had access to Macrobius's early Medieval commentary.

At this point, I'm not going to say too much about the Cicero, because the narrator spends the next several stanzas summarizing the story. He'll tell us everything that we need to know.