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Source: Celebrating Silence: Excerpts from Five Years of Weekly Knowledge 1995-2000
Source: Leadership Gold: Lessons I've Learned from a Lifetime of Leading
                                        
                                        Part 5: "The World of One Physicist", "The 7 Percent Solution", p. 255 
Surely You're Joking, Mr. Feynman! (1985)
                                    
“The only real mistake is the one from which we learn nothing.”
Source: Website of Mehr News Agency, 2017 http://www.mehrnews.com/news/3954046/%D9%BE%D8%B0%DB%8C%D8%B1%D8%B4-%D8%AE%D8%B7%D8%A7-%D8%AF%D8%B1-%D8%AA%D8%B1%D8%A8%DB%8C%D8%AA-%D8%A7%D9%86%D8%B3%D8%A7%D9%86-%D8%B6%D8%B1%D9%88%D8%B1%DB%8C-%D8%A7%D8%B3%D8%AA
                                
                                    “We all learn to make mistakes
and run from them.”
                                
                                
                                
                                
                            
                                        
                                        Misguided Ghosts (2009) 
Lyrics
                                    
Referring to Napoleon III, in "Mistaken Lessons from the Past", The Listener (6 June 1963)
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        