This book is about the human mind in ancient philosophy, with a focus on sense perception, a subject that Richard Sorabji has previously treated more in articles than in books. But it finishes with chapters offering a distinctive view on moral conscience and will. Sense perception raises the further questions of the mind-body relation, of self-awareness, of infinite divisibility and the continuum, of the capacities of animals and children and of the relation between perception and reason. On all topics the introduction interconnects the papers and presents fresh material to fill out the picture. For the topic that has proved most popular, the physiological process in sense perception, a bibliography is provided as well as the latest update. The introduction interconnects the papers and fills out the picture by reference to other writings and to further thoughts. On the final topic, the will, it takes account of a different view that appeared only when the book was in preparation. The picture of the main topics shows that each continued to develop into a richer and richer account throughout the 1200 year course of Ancient Greek Philosophy up to 600 CE.