James Boswell, Samuel Johnson (1824). “The Life of Samuel Johnson, LL. D., Comprehending an Account of His Studies, and Numerous Works, in Chronological Order: A Series of His Epistolary Correspondence and Conversations with Many Eminent Persons; and Various Original Pieces of His Composition, Never Before Published; the Whole Exhibiting a View of Literature and Literary Men in Great Britain, for Near Half a Century During which He Flourished”, p.6
George Santayana, Marianne S. Wokeck, Martin A. Coleman, James Gouinlock (2013). “The The Life of Reason Or The Phases of Human Progress: Reason in Society, Volume VII, Book Two”, p.90, MIT Press