41 Our intense desire is to see the Church become what Christ intended it to be: one, holy, and entirely dedicated to the pursuit of that perfection to which Christ called it and for which He qualified it. In its pilgrimage through the world the Church must really strive to manifest that ideal of perfection envisaged for it by the divine Redeemer. Here, therefore, we have the greatest problem confronting the living Church. It is a problem which shows how powerful and effective the Church really is. It goads it into action, submits it to searching criticism and keeps it true to its purpose. It engenders in the Church prayer and compunction, repentance and hope, toil and confidence, the spirit of adventure and achievement. It is a problem which arises from the very nature of the truths revealed by God and their special relevance to our lives as human beings. For without reference to Christ's teaching handed on by the Church, it is not possible for man to pass judgment on himself and his own nature, his former state of perfection and the ruinous consequences of original sin, his capacity for good and his need for help in desiring and achieving what is good, the importance and purpose of this present life, the good that he seeks or already possesses, how best to acquire perfection and holiness, and how to attain to the highest degree of perfection and completeness. Hence the Church must be gripped with an intense and unfailing desire to learn the ways of the Lord. It is Our dearest wish that all those valuable discussions concerning Christian perfection which have gone on for so many centuries in the Church, shall once again receive the importance they deserve and arouse the faithful, not indeed to formulate new rules of spirituality, but to generate new energies in striving after the holiness which Christ has taught us. His own words and example, his guidance and assistance, have made it possible for us to know about this holiness and to desire it and achieve it. This method of spirituality which is confirmed by the custom and tradition of the Church, established by the united action of its members, and exemplified in the outstanding lives of the Saints.
Source: Ecclesiam Suam (Vatican.va)