Magisterium, Second Vatican Council

2. What has revealed the love of God among us is that the Father has sent into the world His only-begotten Son, so that, being made man, He might by His redemption give new life to the entire human race and unify it.[2] Before offering Himself up as a spotless victim upon the altar, Christ prayed to His Father for all who believe in Him: "that they all may be one; even as thou, Father, art in me, and I in thee, that they also may be one in us, so that the world may believe that thou has sent me".[3] In His Church He instituted the wonderful sacrament of the Eucharist by which the unity of His Church is both signified and made a reality. He gave His followers a new commandment to love one another,[4] and promised the Spirit, their Advocate,[5] who, as Lord and life-giver, should remain with them forever.

After being lifted up on the cross and glorified, the Lord Jesus poured forth His Spirit as He had promised, and through the Spirit He has called and gathered together the people of the New Covenant, who are the Church, into a unity of faith, hope and charity, as the Apostle teaches us: "There is one body and one Spirit, just as you were called to the one hope of your calling; one Lord, one faith, one Baptism".[6] For "all you who have been baptized into Christ have put on Christ ... for you are all one in Christ Jesus".[7] It is the Holy Spirit, dwelling in those who believe and pervading and ruling over the Church as a whole, who brings about that wonderful communion of the faithful. He brings them into intimate union with Christ, so that He is the principle of the Church's unity. The distribution of graces and offices is His work too, [8] enriching the Church of Jesus Christ with different functions "in order to equip the saints for the work of service, so as to build up the body of Christ".[9]

In order to establish this His holy Church everywhere in the world till the end of time, Christ entrusted to the College of the Twelve the task of teaching, ruling and sanctifying.[10] Among their number He selected Peter, and after his confession of faith determined that on him He would build His Church. Also to Peter He promised the keys of the kingdom of heaven,[11] and after His profession of love, entrusted all His sheep to him to be confirmed in faith[12] and shepherded in perfect unity.[13] Christ Jesus Himself was forever to remain the chief cornerstone[14] and shepherd of our souls.[15]

Jesus Christ, then, willed that the apostles and their successors the bishops with Peter's successor at their head should preach the Gospel faithfully, administer the sacraments, and rule the Church in love. It is thus, under the action of the Holy Spirit, that Christ wills His people to increase, and He perfects His people's fellowship in unity: in their confessing the one faith, celebrating divine worship in common, and keeping the fraternal harmony of the family of God.

The Church, then, is God's only flock; it is like a standard lifted high for the nations to see it:[16] for it serves all mankind through the Gospel of peace[17] as it makes its pilgrim way in hope toward the goal of the fatherland above.[18]

This is the sacred mystery of the unity of the Church, in Christ and through Christ, the Holy Spirit energizing its various functions. It is a mystery that finds its highest exemplar and source in the unity of the Persons of the Trinity: the Father and the Son in the Holy Spirit, one God.

3. Even in the beginnings of this one and only Church of God there arose certain rifts,[19] which the Apostle strongly condemned.[20] But in subsequent centuries much more serious dissensions made their appearance and quite large communities came to be separated from full communion with the Catholic Church for which, often enough, men of both sides were to blame.

The children who are born into these Communities and who grow up believing in Christ cannot be accused of the sin involved in the separation, and the Catholic Church embraces upon them as brothers, with respect and affection. For men who believe in Christ and have been truly baptized are in communion with the Catholic Church even though this communion is imperfect. The differences that exist in varying degrees between them and the Catholic Church- whether in doctrine and sometimes in discipline, or concerning the structure of the Church--do indeed create many obstacles, sometimes serious ones, to full ecclesiastical communion. The ecumenical movement is striving to overcome these obstacles. But even in spite of them it remains true that all who have been justified by faith in Baptism are members of Christ's body,[21] and have a right to be called Christian, and so are correctly accepted as brothers by the children of the Catholic Church.[22]

Moreover, some and even very many of the significant elements and endowments which together go to build up and give life to the Church itself, can exist outside the visible boundaries of the Catholic Church: the written word of God; the life of grace; faith, hope and charity, with the other interior gifts of the Holy Spirit, and visible elements too. All of these, which come from Christ and lead back to Christ, belong by right to the one Church of Christ.

The brethren divided from us also use many liturgical actions of the Christian religion. These most certainly can truly engender a life of grace in ways that vary according to the condition of each Church or Community. These liturgical actions must be regarded as capable of giving access to the community of salvation.

It follows that the separated Churches[23] and Communities as such, though we believe them to be deficient in some respects, have been by no means deprived of significance and importance in the mystery of salvation. For the Spirit of Christ has not refrained from using them as means of salvation which derive their efficacy from the very fullness of grace and truth entrusted to the Church.

Nevertheless, our separated brethren, whether considered as individuals or as Communities and Churches, are not blessed with that unity which Jesus Christ wished to bestow on all those who through Him were born again into one body, and with Him quickened to newness of life- that unity which the Holy Scriptures and the ancient Tradition of the Church proclaim. For it is only through Christ's Catholic Church, which is "the all-embracing means of salvation," that they can benefit fully from the means of salvation. We believe that Our Lord entrusted all the blessings of the New Covenant to the apostolic college alone, of which Peter is the head, in order to establish the one Body of Christ on earth to which all should be fully incorporated who belong in any way to the people of God. This people of God, though still in its members liable to sin, is ever growing in Christ during its pilgrimage on earth, and is guided by God's gentle wisdom, according to His hidden designs, until it shall happily arrive at the fullness of eternal glory in the heavenly Jerusalem.

4. Today, in many parts of the world, under the inspiring grace of the Holy Spirit, many efforts are being made in prayer, word and action to attain that fullness of unity which Jesus Christ desires. The Sacred Council exhorts all the Catholic faithful to recognize the signs of the times and to take an active and intelligent part in the work of ecumenism.

The term "ecumenical movement" indicates the initiatives and activities planned and undertaken, according to the various needs of the Church and as opportunities offer, to promote Christian unity. These are: first, every effort to avoid expressions, judgments and actions which do not represent the condition of our separated brethren with truth and fairness and so make mutual relations with them more difficult; then, "dialogue" between competent experts from different Churches and Communities. At these meetings, which are organized in a religious spirit, each explains the teaching of his Communion in greater depth and brings out clearly its distinctive features. In such dialogue, everyone gains a truer knowledge and more just appreciation of the teaching and religious life of both Communions. In addition, the way is prepared for cooperation between them in the duties for the common good of humanity which are demanded by every Christian conscience; and, wherever this is allowed, there is prayer in common. Finally, all are led to examine their own faithfulness to Christ's will for the Church and accordingly to undertake with vigor the task of renewal and reform.

When such actions are undertaken prudently and patiently by the Catholic faithful, with the attentive guidance of their bishops, they promote justice and truth, concord and collaboration, as well as the spirit of brotherly love and unity. This is the way that, when the obstacles to perfect ecclesiastical communion have been gradually overcome, all Christians will at last, in a common celebration of the Eucharist, be gathered into the one and only Church in that unity which Christ bestowed on His Church from the beginning. We believe that this unity subsists in the Catholic Church as something she can never lose, and we hope that it will continue to increase until the end of time.

However, it is evident that, when individuals wish for full Catholic communion, their preparation and reconciliation is an undertaking which of its nature is distinct from ecumenical action. But there is no opposition between the two, since both proceed from the marvelous ways of God.

Catholics, in their ecumenical work, must assuredly be concerned for their separated brethren, praying for them, keeping them informed about the Church, making the first approaches toward them. But their primary duty is to make a careful and honest appraisal of whatever needs to be done or renewed in the Catholic household itself, in order that its life may bear witness more clearly and faithfully to the teachings and institutions which have come to it from Christ through the Apostles.

For although the Catholic Church has been endowed with all divinely revealed truth and with all means of grace, yet its members fail to live by them with all the fervor that they should, so that the radiance of the Church's image is less clear in the eyes of our separated brethren and of the world at large, and the growth of God's kingdom is delayed. All Catholics must therefore aim at Christian perfection[24] and, each according to his station, play his part that the Church may daily be more purified and renewed. For the Church must bear in her own body the humility and dying of Jesus,[25] against the day when Christ will present her to Himself in all her glory without spot or wrinkle.[26]

All in the Church must preserve unity in essentials. But let all, according to the gifts they have received enjoy a proper freedom, in their various forms of spiritual life and discipline, in-their different liturgical rites, and even in their theological elaborations of revealed truth. In all things let charity prevail. If they are true to this course of action, they will be giving ever better expression to the authentic catholicity and apostolicity of the Church.

On the other hand, Catholics must gladly acknowledge and esteem the truly Christian endowments from our common heritage which are to be found among our separated brethren. It is right and salutary to recognize the riches of Christ and virtuous works in the lives of others who are bearing witness to Christ, sometimes even to the shedding of their blood. For God is always wonderful in His works and worthy of all praise.

Nor should we forget that anything wrought by the grace of the Holy Spirit in the hearts of our separated brethren can be a help to our own edification. Whatever is truly Christian is never contrary to what genuinely belongs to the faith; indeed, it can always bring a deeper realization of the mystery of Christ and the Church.

Nevertheless, the divisions among Christians prevent the Church from attaining the fullness of catholicity proper to her, in those of her sons who, though attached to her by Baptism, are yet separated from full communion with her. Furthermore, the Church herself finds it more difficult to express in actual life her full catholicity in all her bearings.

This Sacred Council is gratified to note that the participation by the Catholic faithful in ecumenical work is growing daily. It commends this work to the bishops everywhere in the world to be vigorously stimulated by them and guided with prudence.