Concerned with the meaning and function of principles in an era that appears to have given up on their possibility altogether, Christopher P. Long traces the paths of Aristotle's thinking concerning finite being from the Categories, through the Physics, to the Metaphysics, and ultimately into the Nicomachean Ethics. Long argues that a dynamic and open conception of principles emerges in these works that challenges the traditional tendency to seek security in permanent and eternal absolutes. He rethinks the meaning of Aristotle's notion of principle (arche) and spans the divide of analytic and continental methodological approaches to ancient Greek philosophy, while connecting Aristotle's thinking to that of Levinas, Gadamer, and Heidegger.