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As quoted in The Martians of Science : Five Physicists Who Changed the Twentieth Century (2006) by István Hargittai, p. 251
            direction and vigour 
Source: Precepts and Judgments (1919), p. 138
        
“I hate doubt, yet I am certain that doubt is the only way to approach anything worth believing in.”
As quoted in The Martians of Science : Five Physicists Who Changed the Twentieth Century (2006) by István Hargittai, p. 251
                                
                                    “For what is worth in anything
But so much money as 't will bring?”
                                
                                
                                
                                
                            
                                        
                                        Canto I, line 465 
Source: Hudibras, Part II (1664)
                                    
“All men who have turned out worth anything have had the chief hand in their own education.”
Letter to J. G. Lockhart (c. 16 June 1830), in H. J. C. Grierson (ed.), Letters of Sir Walter Scott, Vol. II (1936), as reported in The Oxford Dictionary of Quotations (1999), p. 652
                                        
                                        Source: http://www.friesian.com/quotes.htm Pennsylvania Gazette], Feb. 20, 1788
https://www.newspapers.com/newspage/41022229/, archived image from newspapers.com, Pennsylvania Gazette, Feb. 20, 1788 page 2 column 2
                                    
                                        
                                        General Robert E. Lee, Part IV, CH 5: Longsteet, p.361 
The Killer Angels (1974)
                                    
“An army of principles will penetrate where an army of soldiers cannot”
                                        
                                        1790s, Agrarian Justice (1797) 
Source: Common Sense, The Rights of Man and Other Essential Writings 
Context: An army of principles will penetrate where an army of soldiers cannot; it will succeed where diplomatic management would fall: it is neither the Rhine, the Channel, nor the ocean that can arrest its progress: it will march on the horizon of the world, and it will conquer.
                                    
To Alvin C. York, on his extraordinary capture of over a hundred enemy troops behind enemy lines, as quoted in the Preface of Sergeant York And His People (1922) http://www.gutenberg.org/ebooks/19117 by Sam K. Cowan
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        