I would suggest the book, The Most Brilliant Thoughts of All Times (In two lines or less). This book appears on the home page here from time to time. I don't own the book but I checked it out at the Library in 2002. It is on my list of books to buy in 2003. I like the book because it features short quotes. Short quotes are easier to memorize. The only book on quotations that I own is, The Pocket Book of Quotations.