Theological discussion in the last decade, among Catholics at least, has been largely devoted to the renewal of the Church proposed by the second Vatican Council. The question of the Church, its nature, its unity and its structures, and the problem of the relation of the Church to present-day society, have been at the forefront of interest. Ecumenical theology, the theology o the world, political theology, and theologies of secularization, of development, of revolution and of liberation have dominated the discussion. The associated problems however are by no means resolved. And they clearly cannot be resolved on the level of ecclesiology.