Religious literature
Dante. "Purgatorio [Purgatory]." La Comedia di Dante Alleghieri [The Divine Comedy by Dante Alighieri]. Foligno: Johann Numeister and Evangelista Angelini da Trevi, 1472.
Dante. "The Purgatorio." The Divine Comedy, edited by David H. Higgins, translated by C. H. Sisson. Oxford University Press, 2008.
The Quran. c. 630, 9:129.
The Quran, translated by M. A. S. Abdel Haleem. Oxford University Press, 2005, ch. 9.
Dhammapada. c. 550 BC, v. 76.
The Dhammapada, edited and translated by Valerie Roebuck. Penguin Classics, 2010, v. 76.
Laozi [Lao Tzu]. 道德經 [Tao Te Ching]. c. 400 BC, ch. 2.
Laozi [Lao Tzu]. "The Natural Way of Lao Tzu." A Source Book in Chinese Philosophy, translated by Wing-Tsit Chan. Princeton University Press, 1969, ch. 2.
Laozi [Lao Tzu]. 道德經 [Tao Te Ching]. c. 400 BC, ch. 48.
Laozi [Lao Tzu]. "The Natural Way of Lao Tzu." A Source Book in Chinese Philosophy, translated by Wing-Tsit Chan. Princeton University Press, 1969, ch. 48.
Alighieri, Dante. "Inferno [Hell]." La Comedia di Dante Alleghieri [The Divine Comedy by Dante Alighieri]. Foligno: Johann Numeister and Evangelista Angelini da Trevi, 1472.
Alighieri, Dante. "Inferno." The Divine Comedy, edited by David H. Higgins, translated by C. H. Sisson. Oxford University Press, 2008.
The Holy Bible: The King James Version. 1611. (Genesis 25:27).
Saint Thomas Aquinus. Summa Theologica. c. 1274, pt. 1-2.
Saint Thomas Aquinus. The Summa Theologica of St. Thomas Aquinas, translated by Fathers of the English Dominican Provinc. Christian Classics, 1981, pt. 1-2.
The Holy Bible: The King James Version. 1611. (Ecclesiastes 8:15).
The Holy Bible: The King James Version. 1611. (Ecclesiastes 12:12).
The Quran. c. 630, 18:23-24.
The Quran, translated by M. A. S. Abdel Haleem. Oxford University Press, 2005, ch. 18.