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Attributed
                                    
Source: Teaching Critical Thinking: Practical Wisdom
                                        
                                        As quoted in Walden (1854) by Henry David Thoreau, Ch. 1 
Attributed
                                    
                                        
                                        Confucius, as quoted in Walden (1854) by Henry David Thoreau, Ch. 1 
Misattributed
                                    
The Crown of Wild Olive, lecture IV: The Future of England, section 151 (1866).
“Till we know that, what is all our knowledge; how shall we even so much as "detect?”
                                        
                                        For the vulpine sharpness, which considers itself to be knowledge, and "detects" in that fashion, is far mistaken. Dupes indeed are many: but, of all dupes, there is none so fatally situated as he who lives in undue terror of being duped. 
1840s, Heroes and Hero-Worship (1840), The Hero As King
                                    
                                        
                                        “Western Civ,” p. 18. 
Giants and Dwarfs (1990)
                                    
Letters and papers from Prison (1997), p. 311. May 25, 1944 letter to Eberhard Bethge,
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        