“There was hardly a page in Markov's book which did not feature the normal law and it cast a spell over me from which I have never fully recovered. Adding to the fascination was the impression that somehow the normal law was the key to mysterious and elusive world of chance phenomena.”

Attributed to Augustine in "Select Proverbs of All Nations" (1824) by "Thomas Fielding" (John Wade), p. 216 http://www.archive.org/details/selectproverbsa00wadegoog, and later in the form "The World is a book, and those who do not travel read only a page", as quoted in 20,000 Quips & Quotes (1995) by Evan Esar, p. 822; this has not been located in Augustine's writings, and may be a variant translation of an expression found in Le Cosmopolite (1753) by Fougeret de Monbron: "The universe is a sort of book, whose first page one has read when one has seen only one's own country."
Misattributed

Source: Enigmas Of Chance (1985), Chapter 4, On Toast!, p. 90.

Quoted in "Stephen Hawking prepares for weightless flight", New Scientist (26 April 2007) http://www.newscientist.com/article/dn11722-stephen-hawking-prepares-for-weightless-flight.html

Part of his public message upon arrival on his second visit to America (19 May 1932).
General sources

Source: A Walk to Remember

Robert: Act 1, Scene 1
Beyond the Horizon (1918)

On the basis of his legal decisions, in Ch. 9
A Narrative of the Life of David Crockett (1834)

On the Diverging Conceptions of Fairness in English and Bulgarian Contract Law: The Peculiar Transformation(s) of Roman Causa, " https://ouclf.iuscomp.org/on-the-diverging-conceptions-of-fairness-in-english-and-bulgarian-contract-law-the-peculiar-transformations-of-roman-causa/#more-665", Oxford University Comparative Law Forum, Vol. 2019