Well, I thought there’d be more people who had the book and could just pop over to page 433 and comment (so I could save my lazy butt some typing); but here’s the whole thing Ott writes on the subject:
3 objects of confession: grievous sins, venial sins, sins already forgiven
"*Sins already forgiven
**Those sins which are already forgiven directly
by the Church's Power of the Keys are a sufficient
object of confession. (Sent. certa.) CIC 902.**
According to the declaration of Benedict XI (D 470), the repetition of confession is an act of submission and therefore of atonement. In this case the absolution, according to the teaching of theologians, results not only in the removal of those obstacles which remain as an effect of the sins already forgiven, and which oppose the efficacy of grace (reliquae peccatorum), but also in the remission of the temporal punishments of sin which remain.*"
The “(Sent. certa.)” means a teaching theologically certain, one of the theological grades of certainty that Ott uses. Another example of Senta. certa. : “Sanctifying grace makes the just man a Temple of the Holy Ghost. (Senta. certa.)”
The “CIC 902” refers to the Codex Iuris Canonici.
The “D 470” stands for H. Denziger–C. Rahner, Enchiridion symbolorum, definitionum et declarationum de rebus fidei et morum.
Thanks for the replies everybody. LilyM, “devotional confession” is something I’ve never heard of–thanks.