Again great book! Good bedside inspiration. Who are these people that keep asking for the sources of the quotes when the book CLEARLY states that these are quotations by 'Unknown Authors'? Unknown means that no one know who the authors are - which part don't you get? Focus on what the book offers, rather than make stupid statements.
I have now read all 3 books and they offer exactly what the title says. They are all excellent! Another person rated this book only 3 stars as he wanted the quotations attributed to the authors. Hey buddy, which part of, by Unknown Authors' don't you understand? No one knows who wrote them - it is clearly stated in the book. You should focus on the positive, i.e. that the editor actually made an effort to collect these and share them with everyone for free!