“To a man with a hammer, everything looks like a nail.”
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Jodi Picoult 595
Author 1966Related quotes
“When you don't have a hammer, you don't want anything to look like a nail.”
                                        
                                        Alternate version: If you don't have a hammer, you don't want anything to look like a nail. 
Of Paradise and Power, p. 26 
According to Kagan, this is a variation of the proverb "When you have a hammer, all problems start to look like nails." (p. 25 of the same book)
                                    
                                        
                                        The Psychology of Science: A Reconnaissance (1966), Ch. 2, p. 15; although some similar statements to describe fundamental errors in human perception have been attributed to others, his expression, or slight paraphrases of it, is one of the earliest yet found to be documented in published writings, and remains among the most popular. 
1940s-1960s
                                    
“If you only have a hammer, you tend to see every problem as a nail.”
“It is better to be the hammer than the nail.”
                                        
                                        Egwene al'Vere 
(15 October 1991)
                                    
                                        
                                        "I am Goya"; translated by Stanley Kunitz, p. 3. 
Antiworlds, and the Fifth Ace
                                    
                                        
                                        At an interview with Stephen Colbert at Montclair Kimberley Academy on January 29th, 2010. 
2010s 
Variant: If you start wielding a hammer, then all your problems look like nails. And maybe they’re not. Maybe it's more subtle than that. And so your toolkit has to be able to morph into what is necessary for what it is that you confront at that moment.
                                    
“I held a nail in place and slammed it with the hammer. Best. Chore. Ever.”
Source: Immortal Beloved