M. Scott Peck (2002). “The Road Less Traveled, 25th Anniversary Edition: A New Psychology of Love, Traditional Values, and Spiritual Growth”, p.83, Simon and Schuster
Joseph Butler, Stephen L. Darwall (1983). “Five Sermons, Preached at the Rolls Chapel and A Dissertation Upon the Nature of Virtue”, p.47, Hackett Publishing
Adam Clarke (1837). “The Holy Bible: Containing the Old and New Testaments, the Text Carefully Printed from the Most Correct Copies of the Present Authorized Translation, Including the Marginal Readings and Parallel Texts. With a Commentary and Critical Notes Designed as a Help to a Better Understanding of the Sacred Writings”, p.555