"The punishment of original sin is the deprivation of the sight of God, but the punishment of actual sin is the torment of eternal hell" (Pope Innocent III).
"according as their works were good or bad, either perpetual punishment with the devil or eternal glory with Christ" (The Fourth General Lateran Council 1215).
"But whoever dies in mortal sin without penance will without any doubt suffer for ever in the fires of eternal hell" (Pope Innocent IV's Letter to the Bishop of Tusculum 1254).
Quotes Taken from "The Teaching of the Catholic Church" (Edited by Karl Rahner, S.J.).