Several members of the class have already made remarks on the separations that St. Augustine makes when giving his sermon. He makes each one in order to reach to all those within his audience. I think that there is more to be said on the grand speech in his sermon
While some note that St. Augustine's sermon is pretty cut and dry in regards to where he puts his style, I would like to add the fact that the entire sermon is entwined with high speech designated at everyone to move them for one single purpose of reminding them of the struggle that it is to forgive and be forgiven. He takes several scriptures, all focusing on the universality of brotherly love, and seeds them through to make his point. For example, early on in the speech, he quotes from the Savior's sermon on the mount and reminds us of the beams in our own eyes. He then compares the pride and anger to a sapling or twig that will grow into a tree blooming in hatred if we do not uproot it ourselves. He uses such eloquent words and phrases to inspire the people to work for their own forgiveness from God and from others.
Now, St. Augustine may not have pulled out any of his own life experiences in his sermon, which would've theoretically won him points in the pathos and ethos categories, but he does retain a symbol of a servant of God and official, which also pulls up his ethos. I think though that he does include himself in his sermon. For one, he never claims exemption, and second, he makes the point that it applies to everyone by using "we". He seems to consider himself part of the group and does not exclude himself at all.
