The Development of Dogma examines the nature of dogmatic statements and the causes of development. It devotes particular attention to the emergence of the form of dogmatic statements at the Council of Nicaea, but notes how this form is anticipated in the New Testament. It situates dogma and its development within the matrix of the great fundamental theological realities of Scripture, Tradition, and Magisterium. Fr. Mansini examines at some length how the Church comes to recognize a development as a genuine development rather than as a distortion of the word of God. The Development of Dogma is especially valuable today for its discussion and defense of the philosophical presuppositions of dogma, which are often simply presupposed but should not be ignored in a complete account of development. These presuppositions touch on fundamental philosophical issues, including the nature of knowledge, the objectivity and trustworthiness of names, and the various logical forms employed in understanding how development is related to a closed revelation. The historicity of human knowledge is also addressed, and the role of dogma itself in heading off the extreme relativism the historical nature of man is supposed to imply for ecclesial faith and life. The Church's dogma about dogma enunciated at the First Vatican Council is also examined. The role of certain fundamental concepts in understanding the possibility of the irreformability of dogma it speaks of is expressly addressed—concepts in principle accessible to all human beings and that enable a trans-cultural, trans-temporal proposal and reception of revealed truth.

The first part of the book explains the antecedent probability both of revelation and of God’s institution of a church. It is ecclesiology in the mode of fundamental theology. The second part rounds up what Scripture and Tradition teach about the Church under the heads of the People of God, the Temple of the Holy Spirit, the Bride of Christ, and the Body of Christ. The chapters present this thematic material under each head as a unified whole, across the Testaments, with each chapter keyed to one of the “marks” of the Church: the catholicity of the people of God, the apostolicity of the ministers of the messianic temple, the holiness of the Bride of Christ, and the unity of the Body of Christ. This already organizes things in a proto-systematic frame. The third part of the book gives systematic exploration, in reverse order, to the unity of the Church, with attention to non-Catholic ecclesial communities and churches, to the holiness of the Church, objective and subjective, to the apostolicity of the Church and her mediation of revealed truth and grace, and to the catholicity of the Church, with attention to non-Christian religions. The center of the book, on the definition of the Church as the sacrament of communion, renders recent French Dominican ecclesiology in a form more accessible to undergraduates and seminarians, rooting it in the New Testament teachings on communion and mysterion. The book concludes with a strenuous argument for the necessity of the Church and her mission of evangelization. Thus, the trajectory of the book is from the naturally knowable antecedent probability of the Church to its revealed necessity.

Fundamental Theology examines the light by which the mysteries of Christ and the Church, the Trinity and the Sacraments, are revealed to us. That light we call "revelation," and fundamental theology examines in the first place what this light shows about itself, and how it is sustained in the world. Or again, fundamental theology considers what the word of God has to say both about itself and what it has to say about where in the world it is to be heard. So, first it is a theology of Revelation (chapter 1), and second, a theology of the transmission of Revelation in Tradition, Scripture, and the Church (chapters 2, 3, and 4). Why must Revelation have the shape it does, and why must it be constituted by both word and event? Why is Tradition prior to Scripture, why must the word of God be written down, and why must Scripture come to us in two testaments? And why must the message conveyed in Tradition and Scripture have a living interpreter in the Church?

Since no word is spoken unless it is heard, fundamental theology also investigates the conditions of hearing the word of God, the very hearing itself in the assent of faith, and a necessary consequence of this hearing. The remote conditions of hearing are also what theology calls our ability to come to the knowledge of the preambula fidei- the things about God than can be known by the natural light (chapter 5). The immediate condition of hearing is the credibility of the word (chapter 6). Hearing is faith (chapter 7). And true hearing gives the hearer to recapitulate what is heard in his own wondering and thankful voice in theology (chapter 8). The introduction to theology in the last chapter is by way of considering the history of Catholic theology in the 20th century.