Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hidden truths revealed

For me, I had read Machiavelli and was shocked yet awakened to the ruthless mind. In the Princessa, which I read in '99, the most important and useful truth for me was the statement: "One act reveals the enemy's entire strategy". This is something I have experimented with over and over and have found it to be true in evaluating people's and company's motives. If a book can teach me an important lesson that stays with me for years, it's worth reading.