Charles Haddon Spurgeon (1988). “Spurgeon at His Best: Over 2200 Striking Quotations from the World's Most Exhaustive and Widely-read Sermon Series”, Baker Publishing Group
Oswald Chambers (2010). “Christian Disciplines: Building Strong Christian Character through Divine Guidance, Suffering, Peril, Prayer, Loneliness, and Patience”, p.158, Discovery House
John Bunyan, George Offor (1862). “The Whole Works of John Bunyan: Accurately Reprinted from the Authors Own Editions ; Wth Editorial Prefaces, Notes, and Life of Bunyan”, p.134