"As the impact settled in, the author [Dale Carnegie] grew amazed by the breadth as well as the volume of the book's [How to Win Friends and Influence People] appeal. 'One day my publishers received two orders in the same mail," he told a journalist with a laugh. 'One was from a theological seminary, which wanted 50 copies for its ministerial students. The other came from a madame of a high-class bordello in Paris. She needed nine copies for her girls. I am the only author you ever saw who wrote a book used as a text in two such highly divergent fields.'"
--Steven Watts, Self-help Messiah, p. 263