According to Wikipedia, "Prester John is a 1910 adventure novel by John Buchan. It tells the story of a young Scotsman named David Crawfurd and his adventures in South Africa, where a Zulu uprising is tied to the medieval legend of Prester John. Crawfurd is similar in many ways to Buchan's later character, Richard Hannay. It contains the notable line: 'Perfect love casteth out fear, the Bible says; but, to speak it reverently, so does perfect hate.' John Buchan, 1st Baron Tweedsmuir (26 August 1875 – 11 February 1940) was a Scottish novelist and Unionist politician who served as Governor General of Canada. Buchan's 100 works include nearly thirty novels, seven collections of short stories and biographies of Sir Walter Scott, Caesar Augustus, and Oliver Cromwell. Buchan's most famous of his books were the spy thrillers (including) The 39 Steps (which was converted to a play as well as an Alfred Hitchcock movie starring Robert Donat as Richard Hannay, though with Buchan's story much altered.) The "last Buchan" (as Graham Greene entitled his appreciative review) was the 1941 novel Sick Heart River (American title: Mountain Meadow), in which a dying protagonist confronts in the Canadian wilderness the questions of the meaning of life. The insightful quotation "It's a great life, if you don't weaken" is famously attributed to Buchan, as is "No great cause is ever lost or won, The battle must always be renewed, And the creed must always be restated."