"'Courageous' filmmaker Alex Kendrick branches out with a new book, a new Erwin Brothers comedy and a new production company". Interview with John W. Kennedy, www.beliefnet.com. July 2013.
Angelus Silesius, Frederick Franck (2005). “Messenger of the Heart: The Book of Angelus Silesius with Observations by the Ancient Zen Masters”, p.39, World Wisdom, Inc