The duke had a mind that ticked like a clock and, like a clock, it regularly went cuckoo.
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Medieval Sourcebook: Anselm (1033-1109): Proslogium (fordham.edu)In this brief work the author aims at proving in a single argument the existence of God, and whatsoever we believe of God. –The difficulty of the task. –The author writes in the person of one who contemplates God, and seeks to understand what he believes. To this work he had given this title: Faith Seeking Understanding. He finally named it Proslogium, –that is, A Discourse.
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Terry Pratchett (Wikipedia)Sir Terence David John Pratchett OBE (28 April 1948 – 12 March 2015) was an English humourist, satirist, and author of fantasy novels, especially comical works. He is best known for his Discworld series of 41 novels.