This is a terrific quotation from Joseph Ratzinger:
In the Church, the debate (about freedom) concerns liberty in its deepest sense, as openness to the divine Being in order to become a sharer in its life…The fundamental right of Christians is the right to the whole faith…All other liberties in the Church are ordered to this foundational right. Under this common denominator of faith we must leave a wide space for differing projects and forms of spiritual life, and, analogously, to differing forms of thought, so that each with its own richness may contribute to the faith of the Church…What is in question is, on the one hand, the basic right of the faithful to a faith which is pure, and, on the other, the right to express that faith in the thought and language of their own time.
Ref: Joseph Ratzinger as cited by Aidan Nichols, in ‘Walter Kasper and his theological programme’, New Blackfriars Vol. 67 (787) January (1986): 16-24 at 22. (HT to Prof. Tracey Rowland)