Here Cardinal Kasper summarises the results of the Catholic Church's official dialogues with Lutheran, Reformed, Anglican and Methodist Churches over forty years, sets out a blueprint for 'consensus and convergence', and sets out a map for the way forward for ecumenism. From such a source, this document is therefore of crucial importance. The book focuses on the major issues in ecumenical dialogue - Jesus Christ, The Holy Trinity, Justification, The Church and The Sacraments of Baptism and Eucharist. Cardinal Kasper explains the key issues at stake and offers signposts for the way forward so that the wish of Jesus may be fulfilled: That They May All Be One.
The style of this book is modeled on Pascal, Solomon, and Jesus: short answers and single points to ponder rather than long strings of argument. The writing is direct, simple, and confrontational, but vertically rather than horizontally by "directing arrows not against each other (Protestant or Catholic) but against our own hearts and minds and wills."
The purpose of this book, writes Kreeft, is to be "like an Australian sheepdog, herding and hectoring Christ's separated sheep back to His face. For that is the only way they can ever return back to each other."