Purgatory (Latin "purgare", to make clean, to purify), in accordance with Catholic teaching, is a place or condition of temporal punishment for those who, departing this life in God's grace, are not entirely free from venial faults, or have not fully paid the satisfaction due to their transgressions.
The whole penitential system of the Church testifies that the voluntary assumption of penitential works has always been part of true repentance. The councils of the Church remind the faithful that God does not always remit the whole punishment due to sin together with the guilt. God requires satisfaction, and will punish sin, and this doctrine involves as its necessary consequence a belief that the sinner failing to do penance in this life may be punished in another world, and so not be cast off eternally from God.
In this book Fr. F. X. Schouppe explores the topic fully, referring to examples from the lives of the saints. An engaging classic that will help the reader better connect with his faith and the saints of the Church.