16 In the teaching of the Second Vatican Council there is a clear connection between renewal, conversion and reform. The Council states that "Christ summons the Church, as she goes her pilgrim way, to that continual reformation of which she always has need, insofar as she is an institution of human beings here on earth. Therefore, if the influence of events or of the times has led to deficiencies ... these should be appropriately rectified at the proper moment". No Christian Community can exempt itself from this call. By engaging in frank dialogue, Communities help one another to look at themselves together in the light of the Apostolic Tradition. This leads them to ask themselves whether they truly express in an adequate way all that the Holy Spirit has transmitted through the Apostles. With regard to the Catholic Church, I have frequently recalled these obligations and perspectives, as for example on the anniversary of the Baptism of Kievan Rus' or in commemorating the eleven hundred years since the evangelizing activity of Saints Cyril and Methodius. More recently, the Directory for the Application of Principles and Norms on Ecumenism , issued with my approval by the Pontifical Council for Promoting Christian Unity, has applied them to the pastoral sphere.
Source: Ut Unum Sint (Vatican.va)