Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excerpts from the note of appreciation I wrote to the author

I enjoyed "Rational Investing" immensely, and have wholeheartedly recommended it to friends. After (my second) reading...plus after reading Wm. Bernstein's new "Four Pillars of Investing," and formerly reading your "What Wall Street Doesn&#65533;t Want You To Know&#65533; book, as well as Charles Ellis' books, and many if not all of the learning articles on [URL] and your [URL] archives, I've gravitated from being a partial index investor over past years to (just now) using passive index funds exclusively for my entire equity portfolio.As a [retired] CFP and Masters in Wealth Management graduate, I truly appreciate the rarity of great investment sense that is presented in a readable and understandable fashion, and I've found no better source than your writings.Congratulations, and another well deserved "well done"&#65533;Thanks again for the wonderful and most helpful read.Sincerely,Dennis&#65533;