Commentary Par VII 20

The presence of two words directly related to 'justice' in this verse begins by far the largest single deployment in any canto of such words: giusta and giustamente here; giustamente ([Par VII 42]); giusta ([Par VII 50] and [Par VII 51]); giuste ([Par VII 84]); giustizia ([Par VII 119]).  The neighboring canto (VI) is tied for second place with four, thus making these two cantos the center of this concern in a poem that is perhaps more concerned with justice than with any other single political/moral concept.  See C.Inf.III.4.  And now see Boyde (Boyd.2000.1), Chapter Nine.