Book excerpt: This volume of three Studies concentrates on the changes in religious thought and institutions in the eleventh and twelfth centuries, and includes not only monks and nuns but also less organised types of life such as hermits, recluses, crusaders and penitents. It is complementary to Professor Constable's forthcoming book The Reformation of the Twelfth Century, but is dissimilar from it in examining three themes over a long period, from late antiquity to the seventeenth century, in order to show how they changed over time. The interpretation of Mary and Martha deals primarily (but not exclusively) with the balance of action and contemplation in Christian life; the ideal of the imitation of Christ studies the growing emphasis on the human Christ, especially His body and wounds; and the orders of society looks at the conceptual divisions of society and the emergence of the modern idea of a middle class.