“Nothing is more dangerous than an idea, when you have only one idea.”
                                        
                                        Propos sur le Religion no. 74 (1938), under the pen name Alain. 
Alternate translation: “Nothing is more dangerous than an idea, when it's the only one we have.”  IZQuotes https://izquotes.com/quote/%C3%A9mile-chartier/nothing-is-more-dangerous-than-an-idea-when-you-have-only-one-idea-390165 (retrieved 10/30/18).