Books that sharpened my thinking: "An Introduction to Logic" by H.W.B. Joseph, everything written by Ayn Rand, "On the Several Senses of Being in Aristotle" by

Books that sharpened my thinking: "An Introduction to Logic" by H.W.B. Joseph, everything written by Ayn Rand, "On the Several Senses of Being in Aristotle" by Franz Brentano, and the works of Aristotle.