Documents published by the Congregation for the Doctrine of the Faith since the Second Vatican Council to 2005 are now available in one volume….The book is dedicated to Benedict XVI, who as Cardinal Joseph Ratzinger, was prefect of the congregation from 1981 to 2005. Cardinal William Levada, the current prefect of the congregation and author of the introduction, says that the documents are "magisterial interventions that, responding to objections or deformations of the faith, or proposing with authority further reflections on revealed doctrine, support and help theological research." Cardinal Levada adds that "it is not enough to denounce error," but that "it is necessary to recall the facts of tradition and the other elements of Christian tradition that can illuminate the way." "It is not an attempt to substitute the theologians, or to propose a particular theology as the only normative one," he states. What the congregation seeks is "to again propose elements that are not taken into account, but are indispensable for the elaboration of a healthy Catholic theology."