Lumen fidei EN
1 The light of Faith: this is how the Churchís tradition speaks of the great gift brought by Jesus. In Johnís Gospel, Christ says of himself: "I have come as light into the world, that whoever believes in me may not remain in darkness" (Jn 12,46). Saint Paul uses the same image: "God who said ĎLet light shine out of darkness,í has shone in our hearts" (2Co 4,6). The pagan world, which hungered for light, had seen the growth of the cult of the sun god, Sol Invictus, invoked each day at sunrise. Yet though the sun was born anew each morning, it was clearly incapable of casting its light on all of human existence. The sun does not illumine all reality; its rays cannot penetrate to the shadow of death, the place where menís eyes are closed to its light. "No one ó Saint Justin Martyr writes ó has ever been ready to die for his faith in the sun". Conscious of the immense horizon which their faith opened before them, Christians invoked Jesus as the true sun "whose rays bestow life". To Martha, weeping for the death of her brother Lazarus, Jesus said: "Did I not tell you that if you believed, you would see the glory of God?" (Jn 11,40). Those who believe, see; they see with a light that illumines their entire journey, for it comes from the risen Christ, the morning star which never sets.
 Dialogus cum Tryphone Iudaeo, 121, 2: PG 6, 758.
 Clement of Alexandria, Protrepticus, IX: PG 8, 195.
2 Yet in speaking of the light of faith, we can almost hear the objections of many of our contemporaries. In modernity, that light might have been considered sufficient for societies of old, but was felt to be of no use for new times, for a humanity come of age, proud of its rationality and anxious to explore the future in novel ways. Faith thus appeared to some as an illusory light, preventing mankind from boldly setting out in quest of knowledge. The young Nietzsche encouraged his sister Elisabeth to take risks, to tread "new pathsÖ with all the uncertainty of one who must find his own way", adding that "this is where humanityís paths part: if you want peace of soul and happiness, then believe, but if you want to be a follower of truth, then seek". Belief would be incompatible with seeking. From this starting point Nietzsche was to develop his critique of Christianity for diminishing the full meaning of human existence and stripping life of novelty and adventure. Faith would thus be the illusion of light, an illusion which blocks the path of a liberated humanity to its future.
 Brief an Elisabeth Nietzsche (11 June 1865), in: Werke in drei Bšnden, MŁnchen, 1954, 953ff.
3 In the process, faith came to be associated with darkness. There were those who tried to save faith by making room for it alongside the light of reason. Such room would open up wherever the light of reason could not penetrate, wherever certainty was no longer possible. Faith was thus understood either as a leap in the dark, to be taken in the absence of light, driven by blind emotion, or as a subjective light, capable perhaps of warming the heart and bringing personal consolation, but not something which could be proposed to others as an objective and shared light which points the way. Slowly but surely, however, it would become evident that the light of autonomous reason is not enough to illumine the future; ultimately the future remains shadowy and fraught with fear of the unknown. As a result, humanity renounced the search for a great light, Truth itself, in order to be content with smaller lights which illumine the fleeting moment yet prove incapable of showing the way. Yet in the absence of light everything becomes confused; it is impossible to tell good from evil, or the road to our destination from other roads which take us in endless circles, going nowhere.
4 There is an urgent need, then, to see once again that faith is a light, for once the flame of faith dies out, all other lights begin to dim. The light of faith is unique, since it is capable of illuminating every aspect of human existence. A light this powerful cannot come from ourselves but from a more primordial source: in a word, it must come from God. Faith is born of an encounter with the living God who calls us and reveals his love, a love which precedes us and upon which we can lean for security and for building our lives. Transformed by this love, we gain fresh vision, new eyes to see; we realize that it contains a great promise of fulfilment, and that a vision of the future opens up before us. Faith, received from God as a supernatural gift, becomes a light for our way, guiding our journey through time. On the one hand, it is a light coming from the past, the light of the foundational memory of the life of Jesus which revealed his perfectly trustworthy love, a love capable of triumphing over death. Yet since Christ has risen and draws us beyond death, faith is also a light coming from the future and opening before us vast horizons which guide us beyond our isolated selves towards the breadth of communion. We come to see that faith does not dwell in shadow and gloom; it is a light for our darkness. Dante, in the Divine Comedy, after professing his faith to Saint Peter, describes that light as a "spark, which then becomes a burning flame and like a heavenly star within me glimmers". It is this light of faith that I would now like to consider, so that it can grow and enlighten the present, becoming a star to brighten the horizon of our journey at a time when mankind is particularly in need of light.
 Paradiso XXIV, 145-147.
5 Christ, on the eve of his passion, assured Peter: "I have prayed for you that your faith may not fail" (Lc 22,32). He then told him to strengthen his brothers and sisters in that same faith. Conscious of the duty entrusted to the Successor of Peter, Benedict XVI proclaimed the present Year of Faith, a time of grace which is helping us to sense the great joy of believing and to renew our wonder at the vast horizons which faith opens up, so as then to profess that faith in its unity and integrity, faithful to the memory of the Lord and sustained by his presence and by the working of the Holy Spirit. The conviction born of a faith which brings grandeur and fulfilment to life, a faith centred on Christ and on the power of his grace, inspired the mission of the first Christians. In the acts of the martyrs, we read the following dialogue between the Roman prefect Rusticus and a Christian named Hierax: "ĎWhere are your parents?í, the judge asked the martyr. He replied: ĎOur true father is Christ, and our mother is faith in himí". For those early Christians, faith, as an encounter with the living God revealed in Christ, was indeed a "mother", for it had brought them to the light and given birth within them to divine life, a new experience and a luminous vision of existence for which they were prepared to bear public witness to the end.
 Acta Sanctorum, Junii, I, 21.
6 The Year of Faith was inaugurated on the fiftieth anniversary of the opening of the Second Vatican Council. This is itself a clear indication that Vatican II was a Council on faith, inasmuch as it asked us to restore the primacy of God in Christ to the centre of our lives, both as a Church and as individuals. The Church never takes faith for granted, but knows that this gift of God needs to be nourished and reinforced so that it can continue to guide her pilgrim way. The Second Vatican Council enabled the light of faith to illumine our human experience from within, accompanying the men and women of our time on their journey. It clearly showed how faith enriches life in all its dimensions.
 "Though the Council does not expressly deal with faith, it speaks of it on every page, it recognizes its living, supernatural character, it presumes it to be full and strong, and it bases its teachings on it. It is sufficient to recall the Councilís statementsÖ to see the essential importance which the Council, in line with the doctrinal tradition of the Church, attributes to faith, the true faith, which has its source in Christ, and the magisterium of the Church for its channel" (Paul VI, General Audience [8 March 1967]: Insegnamenti V , 705).
7 These considerations on faith ó in continuity with all that the Churchís magisterium has pronounced on this theological virtue ó are meant to supplement what Benedict XVI had written in his encyclical letters on charity and hope. He himself had almost completed a first draft of an encyclical on faith. For this I am deeply grateful to him, and as his brother in Christ I have taken up his fine work and added a few contributions of my own. The Successor of Peter, yesterday, today and tomorrow, is always called to strengthen his brothers and sisters in the priceless treasure of that faith which God has given as a light for humanityís path.
In Godís gift of faith, a supernatural infused virtue, we realize that a great love has been offered us, a good word has been spoken to us, and that when we welcome that word, Jesus Christ the Word made flesh, the Holy Spirit transforms us, lights up our way to the future and enables us joyfully to advance along that way on wings of hope. Thus wonderfully interwoven, faith, hope and charity are the driving force of the Christian life as it advances towards full communion with God. But what is it like, this road which faith opens up before us? What is the origin of this powerful light which brightens the journey of a successful and fruitful life?
 Cf., for example, First Vatican Ecumenical Council, Dogmatic Constitution on the Catholic Faith Dei Filius, Ch. 3: DS 3008-3020; Second Vatican Ecumenical Council, Dogmatic Constitution on Divine Revelation Dei Verbum, DV 5: Catechism of the Catholic Church, Nos. CEC 153-165.
C(cf. 1Jn 4,16)
8 Faith opens the way before us and accompanies our steps through time. Hence, if we want to understand what faith is, we need to follow the route it has taken, the path trodden by believers, as witnessed first in the Old Testament. Here a unique place belongs to Abraham, our father in faith. Something disturbing takes place in his life: God speaks to him; he reveals himself as a God who speaks and calls his name. Faith is linked to hearing. Abraham does not see God, but hears his voice. Faith thus takes on a personal aspect. God is not the god of a particular place, or a deity linked to specific sacred time, but the God of a person, the God of Abraham, Isaac and Jacob, capable of interacting with man and establishing a covenant with him. Faith is our response to a word which engages us personally, to a "Thou" who calls us by name.
9 The word spoken to Abraham contains both a call and a promise. First, it is a call to leave his own land, a summons to a new life, the beginning of an exodus which points him towards an unforeseen future. The sight which faith would give to Abraham would always be linked to the need to take this step forward: faith "sees" to the extent that it journeys, to the extent that it chooses to enter into the horizons opened up by Godís word. This word also contains a promise: Your descendants will be great in number, you will be the father of a great nation (cf. Gn 13,16 Gn 15,5 Gn 22,17). As a response to a word which preceded it, Abrahamís faith would always be an act of remembrance. Yet this remembrance is not fixed on past events but, as the memory of a promise, it becomes capable of opening up the future, shedding light on the path to be taken. We see how faith, as remembrance of the future, memoria futuri, is thus closely bound up with hope.
10 Abraham is asked to entrust himself to this word. Faith understands that something so apparently ephemeral and fleeting as a word, when spoken by the God who is fidelity, becomes absolutely certain and unshakable, guaranteeing the continuity of our journey through history. Faith accepts this word as a solid rock upon which we can build, a straight highway on which we can travel. In the Bible, faith is expressed by the Hebrew word íemŻnah, derived from the verb íaman whose root means "to uphold". The term íemŻnah can signify both Godís fidelity and manís faith. The man of faith gains strength by putting himself in the hands of the God who is faithful. Playing on this double meaning of the word ó also found in the corresponding terms in Greek (pistůs) and Latin (fidelis) ó Saint Cyril of Jerusalem praised the dignity of the Christian who receives Godís own name: both are called "faithful". As Saint Augustine explains: "Man is faithful when he believes in God and his promises; God is faithful when he grants to man what he has promised".
 Cf. Catechesis V, 1: PG 33, 505A.
 In Psal. 32, II, s. I, 9: PL 36, 284.
11 A final element of the story of Abraham is important for understanding his faith. Godís word, while bringing newness and surprise, is not at all alien to Abrahamís experience. In the voice which speaks to him, the patriarch recognizes a profound call which was always present at the core of his being. God ties his promise to that aspect of human life which has always appeared most "full of promise", namely, parenthood, the begetting of new life: "Sarah your wife shall bear you a son, and you shall name him Isaac" (Gn 17,19). The God who asks Abraham for complete trust reveals himself to be the source of all life. Faith is thus linked to Godís fatherhood, which gives rise to all creation; the God who calls Abraham is the Creator, the one who "calls into existence the things that do not exist" (Rm 4,17), the one who "chose us before the foundation of the worldÖ and destined us for adoption as his children" (Ep 1,4-5). For Abraham, faith in God sheds light on the depths of his being, it enables him to acknowledge the wellspring of goodness at the origin of all things and to realize that his life is not the product of non-being or chance, but the fruit of a personal call and a personal love. The mysterious God who called him is no alien deity, but the God who is the origin and mainstay of all that is. The great test of Abrahamís faith, the sacrifice of his son Isaac, would show the extent to which this primordial love is capable of ensuring life even beyond death. The word which could raise up a son to one who was "as good as dead", in "the barrenness" of Sarahís womb (cf. Rm 4,19), can also stand by his promise of a future beyond all threat or danger (cf. He 11,19 Rm 4,21).
12 The history of the people of Israel in the Book of Exodus follows in the wake of Abrahamís faith. Faith once again is born of a primordial gift: Israel trusts in God, who promises to set his people free from their misery. Faith becomes a summons to a lengthy journey leading to worship of the Lord on Sinai and the inheritance of a promised land. Godís love is seen to be like that of a father who carries his child along the way (cf. Dt 1,31). Israelís confession of faith takes shape as an account of Godís deeds in setting his people free and acting as their guide (cf. Dt 26,5-11), an account passed down from one generation to the next. Godís light shines for Israel through the remembrance of the Lordís mighty deeds, recalled and celebrated in worship, and passed down from parents to children. Here we see how the light of faith is linked to concrete life-stories, to the grateful remembrance of Godís mighty deeds and the progressive fulfilment of his promises. Gothic architecture gave clear expression to this: in the great cathedrals light comes down from heaven by passing through windows depicting the history of salvation. Godís light comes to us through the account of his self-revelation, and thus becomes capable of illuminating our passage through time by recalling his gifts and demonstrating how he fulfils his promises.
13 The history of Israel also shows us the temptation of unbelief to which the people yielded more than once. Here the opposite of faith is shown to be idolatry. While Moses is speaking to God on Sinai, the people cannot bear the mystery of Godís hiddenness, they cannot endure the time of waiting to see his face. Faith by its very nature demands renouncing the immediate possession which sight would appear to offer; it is an invitation to turn to the source of the light, while respecting the mystery of a countenance which will unveil itself personally in its own good time. Martin Buber once cited a definition of idolatry proposed by the rabbi of Kock: idolatry is "when a face addresses a face which is not a face". In place of faith in God, it seems better to worship an idol, into whose face we can look directly and whose origin we know, because it is the work of our own hands. Before an idol, there is no risk that we will be called to abandon our security, for idols "have mouths, but they cannot speak" (Ps 115,5). Idols exist, we begin to see, as a pretext for setting ourselves at the centre of reality and worshiping the work of our own hands. Once man has lost the fundamental orientation which unifies his existence, he breaks down into the multiplicity of his desires; in refusing to await the time of promise, his life-story disintegrates into a myriad of unconnected instants. Idolatry, then, is always polytheism, an aimless passing from one lord to another. Idolatry does not offer a journey but rather a plethora of paths leading nowhere and forming a vast labyrinth. Those who choose not to put their trust in God must hear the din of countless idols crying out: "Put your trust in me!" Faith, tied as it is to conversion, is the opposite of idolatry; it breaks with idols to turn to the living God in a personal encounter. Believing means entrusting oneself to a merciful love which always accepts and pardons, which sustains and directs our lives, and which shows its power by its ability to make straight the crooked lines of our history. Faith consists in the willingness to let ourselves be constantly transformed and renewed by Godís call. Herein lies the paradox: by constantly turning towards the Lord, we discover a sure path which liberates us from the dissolution imposed upon us by idols.
 M. Buber, Die Erzšhlungen der Chassidim, ZŁrich, 1949, 793.
14 In the faith of Israel we also encounter the figure of Moses, the mediator. The people may not see the face of God; it is Moses who speaks to YHWH on the mountain and then tells the others of the Lordís will. With this presence of a mediator in its midst, Israel learns to journey together in unity. The individualís act of faith finds its place within a community, within the common "we" of the people who, in faith, are like a single person ó "my first-born son", as God would describe all of Israel (cf. Ex 4,22). Here mediation is not an obstacle, but an opening: through our encounter with others, our gaze rises to a truth greater than ourselves. Rousseau once lamented that he could not see God for himself: "How many people stand between God and me!" Ö "Is it really so simple and natural that God would have sought out Moses in order to speak to Jean Jacques Rousseau?" On the basis of an individualistic and narrow conception of knowledge one cannot appreciate the significance of mediation, this capacity to participate in the vision of another, this shared knowledge which is the knowledge proper to love. Faith is Godís free gift, which calls for humility and the courage to trust and to entrust; it enables us to see the luminous path leading to the encounter of God and humanity: the history of salvation.
 …mile, Paris, 1966, 387.
 Lettre ŗ Christophe de Beaumont, Lausanne, 1993, 110.
15 "Abraham rejoiced that he would see my day; he saw it and was glad" (Jn 8,56). According to these words of Jesus, Abrahamís faith pointed to him; in some sense it foresaw his mystery. So Saint Augustine understood it when he stated that the patriarchs were saved by faith, not faith in Christ who had come but in Christ who was yet to come, a faith pressing towards the future of Jesus. Christian faith is centred on Christ; it is the confession that Jesus is Lord and that God has raised him from the dead (cf. Rm 10,9). All the threads of the Old Testament converge on Christ; he becomes the definitive "Yes" to all the promises, the ultimate basis of our "Amen" to God (cf. 2Co 1,20). The history of Jesus is the complete manifestation of Godís reliability. If Israel continued to recall Godís great acts of love, which formed the core of its confession of faith and broadened its gaze in faith, the life of Jesus now appears as the locus of Godís definitive intervention, the supreme manifestation of his love for us. The word which God speaks to us in Jesus is not simply one word among many, but his eternal Word (cf. He 1,1-2). God can give no greater guarantee of his love, as Saint Paul reminds us (cf. Rm 8,31-39). Christian faith is thus faith in a perfect love, in its decisive power, in its ability to transform the world and to unfold its history. "We know and believe the love that God has for us" (1Jn 4,16). In the love of God revealed in Jesus, faith perceives the foundation on which all reality and its final destiny rest.
 Cf. In Ioh. Evang., 45, 9: PL 35, 1722-1723.
16 The clearest proof of the reliability of Christís love is to be found in his dying for our sake. If laying down oneís life for oneís friends is the greatest proof of love (cf. Jn 15,13), Jesus offered his own life for all, even for his enemies, to transform their hearts. This explains why the evangelists could see the hour of Christís crucifixion as the culmination of the gaze of faith; in that hour the depth and breadth of Godís love shone forth. It was then that Saint John offered his solemn testimony, as together with the Mother of Jesus he gazed upon the pierced one (cf. Jn 19,37): "He who saw this has borne witness, so that you also may believe. His testimony is true, and he knows that he tells the truth" (Jn 19,35). In Dostoevskyís The Idiot, Prince Myshkin sees a painting by Hans Holbein the Younger depicting Christ dead in the tomb and says: "Looking at that painting might cause one to lose his faith". The painting is a gruesome portrayal of the destructive effects of death on Christís body. Yet it is precisely in contemplating Jesusí death that faith grows stronger and receives a dazzling light; then it is revealed as faith in Christís steadfast love for us, a love capable of embracing death to bring us salvation. This love, which did not recoil before death in order to show its depth, is something I can believe in; Christís total self-gift overcomes every suspicion and enables me to entrust myself to him completely.
 Part II, IV.
17 Christís death discloses the utter reliability of Godís love above all in the light of his resurrection. As the risen one, Christ is the trustworthy witness, deserving of faith (cf. Ap 1,5 He 2,17), and a solid support for our faith. "If Christ has not been raised, your faith is futile", says Saint Paul (1Co 15,17). Had the Fatherís love not caused Jesus to rise from the dead, had it not been able to restore his body to life, then it would not be a completely reliable love, capable of illuminating also the gloom of death. When Saint Paul describes his new life in Christ, he speaks of "faith in the Son of God, who loved me and gave himself for me" (Ga 2,20). Clearly, this "faith in the Son of God" means Paulís faith in Jesus, but it also presumes that Jesus himself is worthy of faith, based not only on his having loved us even unto death but also on his divine sonship. Precisely because Jesus is the Son, because he is absolutely grounded in the Father, he was able to conquer death and make the fullness of life shine forth. Our culture has lost its sense of Godís tangible presence and activity in our world. We think that God is to be found in the beyond, on another level of reality, far removed from our everyday relationships. But if this were the case, if God could not act in the world, his love would not be truly powerful, truly real, and thus not even true, a love capable of delivering the bliss that it promises. It would make no difference at all whether we believed in him or not. Christians, on the contrary, profess their faith in Godís tangible and powerful love which really does act in history and determines its final destiny: a love that can be encountered, a love fully revealed in Christís passion, death and resurrection.
18 This fullness which Jesus brings to faith has another decisive aspect. In faith, Christ is not simply the one in whom we believe, the supreme manifestation of Godís love; he is also the one with whom we are united precisely in order to believe. Faith does not merely gaze at Jesus, but sees things as Jesus himself sees them, with his own eyes: it is a participation in his way of seeing. In many areas in our lives we trust others who know more than we do. We trust the architect who builds our home, the pharmacist who gives us medicine for healing, the lawyer who defends us in court. We also need someone trustworthy and knowledgeable where God is concerned. Jesus, the Son of God, is the one who makes God known to us (cf. Jn 1,18). Christís life, his way of knowing the Father and living in complete and constant relationship with him, opens up new and inviting vistas for human experience. Saint John brings out the importance of a personal relationship with Jesus for our faith by using various forms of the verb "to believe". In addition to "believing that" what Jesus tells us is true, John also speaks of "believing" Jesus and "believing in" Jesus. We "believe" Jesus when we accept his word, his testimony, because he is truthful. We "believe in" Jesus when we personally welcome him into our lives and journey towards him, clinging to him in love and following in his footsteps along the way.
To enable us to know, accept and follow him, the Son of God took on our flesh. In this way he also saw the Father humanly, within the setting of a journey unfolding in time. Christian faith is faith in the incarnation of the Word and his bodily resurrection; it is faith in a God who is so close to us that he entered our human history. Far from divorcing us from reality, our faith in the Son of God made man in Jesus of Nazareth enables us to grasp realityís deepest meaning and to see how much God loves this world and is constantly guiding it towards himself. This leads us, as Christians, to live our lives in this world with ever greater commitment and intensity.
19 On the basis of this sharing in Jesusí way of seeing things, Saint Paul has left us a description of the life of faith. In accepting the gift of faith, believers become a new creation; they receive a new being; as Godís children, they are now "sons in the Son". The phrase "Abba, Father", so characteristic of Jesusí own experience, now becomes the core of the Christian experience (cf. Rm 8,15). The life of faith, as a filial existence, is the acknowledgment of a primordial and radical gift which upholds our lives. We see this clearly in Saint Paulís question to the Corinthians: "What have you that you did not receive?" (1Co 4,7). This was at the very heart of Paulís debate with the Pharisees: the issue of whether salvation is attained by faith or by the works of the law. Paul rejects the attitude of those who would consider themselves justified before God on the basis of their own works. Such people, even when they obey the commandments and do good works, are centred on themselves; they fail to realize that goodness comes from God. Those who live this way, who want to be the source of their own righteousness, find that the latter is soon depleted and that they are unable even to keep the law. They become closed in on themselves and isolated from the Lord and from others; their lives become futile and their works barren, like a tree far from water. Saint Augustine tells us in his usual concise and striking way: "Ab eo qui fecit te, noli deficere nec ad te", "Do not turn away from the one who made you, even to turn towards yourself". Once I think that by turning away from God I will find myself, my life begins to fall apart (cf. Lc 15,11-24). The beginning of salvation is openness to something prior to ourselves, to a primordial gift that affirms life and sustains it in being. Only by being open to and acknowledging this gift can we be transformed, experience salvation and bear good fruit. Salvation by faith means recognizing the primacy of Godís gift. As Saint Paul puts it: "By grace you have been saved through faith, and this is not your own doing; it is the gift of God" (Ep 2,8).
 De Continentia, 4, 11: PL 40, 356.
20 Faithís new way of seeing things is centred on Christ. Faith in Christ brings salvation because in him our lives become radically open to a love that precedes us, a love that transforms us from within, acting in us and through us. This is clearly seen in Saint Paulís exegesis of a text from Deuteronomy, an exegesis consonant with the heart of the Old Testament message. Moses tells the people that Godís command is neither too high nor too far away. There is no need to say: "Who will go up for us to heaven and bring it to us?" or "Who will go over the sea for us, and bring it to us?" (Dt 30,11-14). Paul interprets this nearness of Godís word in terms of Christís presence in the Christian. "Do not say in your heart, ĎWho will ascend into heaven?í (that is, to bring Christ down), or ĎWho will descend into the abyss?í (that is, to bring Christ up from the dead)" (Rm 10,6-7). Christ came down to earth and rose from the dead; by his incarnation and resurrection, the Son of God embraced the whole of human life and history, and now dwells in our hearts through the Holy Spirit. Faith knows that God has drawn close to us, that Christ has been given to us as a great gift which inwardly transforms us, dwells within us and thus bestows on us the light that illumines the origin and the end of life.
21 We come to see the difference, then, which faith makes for us. Those who believe are transformed by the love to which they have opened their hearts in faith. By their openness to this offer of primordial love, their lives are enlarged and expanded. "It is no longer I who live, but Christ who lives in me" (Ga 2,20). "May Christ dwell in your hearts through faith" (Ep 3,17). The self-awareness of the believer now expands because of the presence of another; it now lives in this other and thus, in love, life takes on a whole new breadth. Here we see the Holy Spirit at work. The Christian can see with the eyes of Jesus and share in his mind, his filial disposition, because he or she shares in his love, which is the Spirit. In the love of Jesus, we receive in a certain way his vision. Without being conformed to him in love, without the presence of the Spirit, it is impossible to confess him as Lord (cf. 1Co 12,3).
22 In this way, the life of the believer becomes an ecclesial existence, a life lived in the Church. When Saint Paul tells the Christians of Rome that all who believe in Christ make up one body, he urges them not to boast of this; rather, each must think of himself "according to the measure of faith that God has assigned" (Rm 12,3). Those who believe come to see themselves in the light of the faith which they profess: Christ is the mirror in which they find their own image fully realized. And just as Christ gathers to himself all those who believe and makes them his body, so the Christian comes to see himself as a member of this body, in an essential relationship with all other believers. The image of a body does not imply that the believer is simply one part of an anonymous whole, a mere cog in a great machine; rather, it brings out the vital union of Christ with believers and of believers among themselves (cf. Rm 12,4-5). Christians are "one" (cf. Ga 3,28), yet in a way which does not make them lose their individuality; in service to others, they come into their own in the highest degree. This explains why, apart from this body, outside this unity of the Church in Christ, outside this Church which ó in the words of Romano Guardini ó "is the bearer within history of the plenary gaze of Christ on the world" ó faith loses its "measure"; it no longer finds its equilibrium, the space needed to sustain itself. Faith is necessarily ecclesial; it is professed from within the body of Christ as a concrete communion of believers. It is against this ecclesial backdrop that faith opens the individual Christian towards all others. Christís word, once heard, by virtue of its inner power at work in the heart of the Christian, becomes a response, a spoken word, a profession of faith. As Saint Paul puts it: "one believes with the heart ... and confesses with the lips" (Rm 10,10). Faith is not a private matter, a completely individualistic notion or a personal opinion: it comes from hearing, and it is meant to find expression in words and to be proclaimed. For "how are they to believe in him of whom they have never heard? And how are they to hear without a preacher?" (Rm 10,14). Faith becomes operative in the Christian on the basis of the gift received, the love which attracts our hearts to Christ (cf. Ga 5,6), and enables us to become part of the Churchís great pilgrimage through history until the end of the world. For those who have been transformed in this way, a new way of seeing opens up, faith becomes light for their eyes.
 "Vom Wesen katholischer Weltanschauung" (1923), in Unterscheidung des Christlichen. Gesammelte Studien 1923-1963, Mainz, 1963, 24.
Lumen fidei EN