A sharp-witted analyst of the church’s contemporary situation once said: No previous council spoke so extensively and so profoundly about the Church as the Second Vatican Council. After no other council was there such great confusion over the question of what the church is and which form it should take. Church is, as Luther said, a blind, vague word. Indeed it is not easy to say what we mean when we speak of Church.

For one thousand five hundred years the church has lived out its existence and often enough suffered to sustain it in adversity. But not until the fourteenth, fifteenth and sixteenth centuries did the church begin expressis verbis to reflect on its nature. This reflection originally took place against a background of conflicts: conflicts between the papacy and the up-and-coming nation states, conflicts centred around John Wyclif and Jan Hus and above all against the background of debate and argument in the Reformation era. Yet, although the quarrels of the Reformation were not only concerned with individual ecclesiological questions, but much more with the general understanding of what Church is, the sixteenth century did not get as far as reflecting on what the Church’s teaching on the term ‘church’ should be. Not until the nineteenth century, in the wake of Romanticism, did the understanding of the church as such become the subject of consideration. It was Friedrich Schleiermacher who determined the direction of the Protestant Church. On the Catholic side the thoughts of Johann Adam Mohler, the theologian from Tubingen, led the way.