This book is addressed to readers new to the Enneads . One of the greatest of ancient philosophers, Plotinus is attracting ever-increasing attention from those interested in ancient philosophy, late Antiquity, and the importance of this period for the Western intellectual tradition. O'Meara presents a brief outline of Plotinus's life, and of the composition of the Enneads , placing Plotinus within the intellectual context of the philosophical schools and religious movements of his time. He then discusses selected Plotinian texts in relation to a number of central philosophical issues to show how Plotinus's thinking on these issues evolved, and to assess the historical importance of his philosophy.