Literally, it would seem …

… Principles for Dummies - American Affairs Journal. (Hat tip, Dave Lull.)

It seems to have escaped Dalio’s notice and that of his editors—assuming he had any—that Leonardo left us thousands of pages of journals, some of them in museums, some privately owned by Dalio’s friend Bill Gates, all ably edited and available in fine bookstores everywhere. Churchill probably went further in the pursuit of documenting “what guided” him than any statesman in history; even at the height of the war his fellow cabinet officials complained that the essential man spent too much time turning workaday missives into the self-aggrandizing pastiches of Macaulay that he would later quote in his own books. Einstein wrote a great deal about his own life and views. Elsewhere Dalio says something similar about Vince Lombardi, apparently unaware not only of the coach’s best-selling memoir but of his role in the motivational training film Second Effort, one of the first things of its kind ever produced.