Francis Bacon, Richard Whately (1867). “Lord Bacon's Essays: With a Sketch of His Life and Character, Reviews of His Philosophical Writings, Critical Estimates of His Essays, Analysis, Notes, and Queries for Students, and Select Portions of the ʻAnnotationsʼ of Archbishop Whately”, p.296
William Law (1749). “I. The spirit of prayer; or, the soul rising out of the vanity of time, into the riches of eternity. In two parts ; 7,II. The way to divine knowledge; being several dialogues between Humanus, Academicus, Rusticus, and Theophilus”, p.4
William Law (2001). “A Serious Call to a Devout and Holy Life, adapted to the State and Condition of all Orders of Christians, Volume 4”, p.139, Wipf and Stock Publishers