"But I say unto you, that every idle word that men shall speak, they shall render an account for it in the day of judgment." —Matthew 12:36
You would never dream so much is known about Purgatory! In Purgatory: Explained by the Lives and Legends of the Saints, not only is the basic teaching of the Church given here, but also countless true stories of apparitions and revelations on Purgatory from the lives of St. Margaret Mary, St. Gertrude, St. Bridget of Sweden, the Cure of Ars, St. Lidwina of Schiedam, etc.