This book first appeared just over fifty years ago. It is the pilgrimatic work of one of the 20th century's greatest theologians. Deeply rooted in tradition, it breaks ground and sows seeds which will bear their fruit in the Second Vatican Council's central documents on the Church. Here, Henri de Lubac, one of the giants of 20th century theology, gathers from throughout the breadth and length of Catholic tradition elements which he synthesizes to show the essentially social and historical character of the Catholic Church and how this worldwide and agelong dimension of the Church is the only adequate matrix for the fulfillment of the person within society and the transcendence of the person towards God. This book is a classic that deserves to be read and reread by every educated Catholic.