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
Martin Luther (1823). “Martin Luther on the Bondage of the Will: Written in Answer to the Diatribe of Erasmus on Free-will. First Pub. in the Year of Our Lord 1525”, p.60