18 The Church is catholic also because she is able to present in every human context the revealed truth, preserved by her intact in its divine content, in such a way as to bring it into contact with the lofty thoughts and just expectations of every individual and every people. Moreover, the entire patrimony of good which every generation transmits to posterity, together with the priceless gift of life, forms as it were an immense and many-coloured collection of tesserae that together make up the living mosaic of the Pantocrator, who will manifest himself in his total splendour only at the moment of the Parousia. The Gospel does not lead to the impoverishment or extinction of those things which every individual, people and nation and every culture throughout history recognizes and brings into being as goodness, truth and beauty. On the contrary, it strives to assimilate and to develop all these values: to live them with magnanimity and joy and to perfect them by the mysterious and ennobling light of Revelation. The concrete dimension of catholicity, inscribed by Christ the Lord in the very make-up of the Church, is not something static, outside history and flatly uniform. In a certain sense it wells up and develops every day as something new from the unanimous faith of all those who believe in God, One and Three, revealed by Jesus Christ and preached by the Church through the power of the Holy Spirit. This dimension issues quite spontaneously from mutual respect proper to fraternal love-for every person and every nation, great or small, and from the honest acknowledgment of the qualities and rights of brethren in the faith.
Source: Slavorum Apostoli (Vatican.va)