11. Thus since the zealous activity of the Roman Curia, united to the Petrine ministry and based on it, is dedicated to the good both of the whole Church and the particular Churches, the Curia is in the first place being called on to fulfill that ministry of unity which has been entrusted in a singular way to the Roman Pontiff insofar as he has been set up by God’s will as the permanent and visible foundation of the Church. Hence unity in the Church is a precious treasure to be preserved, defended, protected, and promoted, to be for ever exalted with the devoted cooperation of all, and most indeed by those who each in their turn are the visible source and foundation of unity in their own particular Churches.

Therefore the cooperation which the Roman Curia brings to the Supreme Pontiff is rooted in this ministry of unity. This unity is in the first place the unity of faith, governed and constituted by the sacred deposit of which Peter’s successor is the chief guardian and protector and through which indeed he receives his highest responsibility, that of strengthening his brothers. The unity is likewise the unity of discipline, the general discipline of the Church, which constitutes a system of norms and patterns of behaviour, gives shapes to the fundamental structure of the Church, safeguards the means of salvation and their correct administration, together with the ordered structure of the people of God.

Church government safeguards this unity and cares for it at all times. So far from suffering harm from the differences of life and behaviour among various persons and cultures, what with the immense variety of gifts poured out by the Holy Spirit, this same unity actually grows richer year by year, so long as there are no isolationist or centripetal attempts and so long as everything is brought together into the higher structure of the one Church. Our predecessor John Paul I brought this principle to mind quite admirably when he addressed the cardinals about the agencies of the Roman Curia: "[They] provide the Vicar of Christ with the concrete means of giving the apostolic service that he owes the entire Church. Consequently, they guarantee an organic articulation of legitimate autonomies, while maintaining an indispensable respect for that unity of discipline and faith for which Christ prayed on the very eve of his passion."

And so it is that the highest ministry of unity in the universal Church has much respect for lawful customs, for the mores of peoples and for that authority which belongs by divine right to the pastors of the particular Churches. Clearly however, whenever serious reasons demand it, the Roman Pontiff cannot fail to intervene in order to protect unity in faith, in charity, or in discipline.