John Bunyan (1811). “Choice Works: Containing Grace Abounding to the Chief of Sinners: Heart's Ease in Heart Trouble: The World to Come, Or Visions of Heaven and Hell: The Barren Fig-tree: and The River of Water of Life”, p.75
St. Augustine, Dr. Howard Taylor, Mrs. Howard Taylor, Apostolic Fathers, J. Oswald Sanders (2010). “Moody Classics Complete Set”, p.2625, Moody Publishers