Cette citation est attribuée à Dale Carnegie, extraite de son ouvrage 'Comment se faire des amis' (How to Win Friends and Influence People), publié en 1936. Le livre traite des principes de relations humaines et de communication efficace.
"To win someone's sympathy, put them in a favorable mood, and ultimately rally them to your cause, you must first and foremost give them your exclusive attention when they are speaking."