Canto III-IV

Canto3/29 Line88 "And tears they gathered on the evil shore..."
These should in life could or did not choose between heaven or hell. However now we see them wanting cursed with urgency to get to the other side. I'm guessing this will be an accuring theme where your sins in life are used to punish you in hell. Ironic because your doing in Hell what you chose to do in life.

Canto3/31 Line106 "Souls who are good never pass this way"
Once again Dante gives himself a nice pat on the back. Dante is saying it is wierd for a soul, such as himself, to go the way "good" souls normally don't.

pg39 Line 91 Encircled seven times by a barrier of lofty walls,...
Although the people inside the walls cannot go to heaven they are still given their own type of sanctuary. The walls seem almost to set them separate from the rest of Hell. However it's a little ironic these people are there in the first place when Christ saved a few of the more known ones, I think this is mentioned by Dante to tease the Christian faith slightly.

pg41 Line129 "I saw so many I cannot tally the list;"
Dante describes the multitudes of very famous souls stuck in Hell. These people had no choice to go to heaven but are punished anyway with the longing to go there. Why exactly are they punished with longing? Were they supposed to know of Gods existence before Christianity?