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Source: The Art of War, Chapter XIII · Intelligence and Espionage
“He that has a secret should not only hide it, but hide that he has it to hide.”
                                        
                                        Pt. II, Bk. I, ch. 7. 
1830s, The French Revolution. A History (1837)
                                    
                                        
                                        (JP IV A81) 1843 
1840s, The Journals of Søren Kierkegaard, 1840s
                                    
in "Who Discovered the Galaxy - Presidential Address – 1985" http://adsabs.harvard.edu/full/1986JBAA...96..284C, Heather Couper, British Astron. Assoc. Journal V. 96, No. 5 (1986), p. 293, Bibliographic Code: 1986JBAA...96..284C
[Haggard, Ted, Letters from Home, Regal Books, March 2003, p. 18, ISBN 0830730583]
“Men take more pains to hide than to mend themselves.”
Political, Moral, and Miscellaneous Reflections (1750), Miscellaneous Thoughts and Reflections
Source: Tortured For Christ (1967), p. 75.
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        