38 The transmission of the faith not only brings light to men and women in every place; it travels through time, passing from one generation to another. Because faith is born of an encounter which takes place in history and lights up our journey through time, it must be passed on in every age. It is through an unbroken chain of witnesses that we come to see the face of Jesus. But how is this possible? How can we be certain, after all these centuries, that we have encountered the "real Jesus"? Were we merely isolated individuals, were our starting point simply our own individual ego seeking in itself the basis of absolutely sure knowledge, a certainty of this sort would be impossible. I cannot possibly verify for myself something which happened so long ago. But this is not the only way we attain knowledge. Persons always live in relationship. We come from others, we belong to others, and our lives are enlarged by our encounter with others. Even our own knowledge and self-awareness are relational; they are linked to others who have gone before us: in the first place, our parents, who gave us our life and our name. Language itself, the words by which we make sense of our lives and the world around us, comes to us from others, preserved in the living memory of others. Self-knowledge is only possible when we share in a greater memory. The same thing holds true for faith, which brings human understanding to its fullness. Faith’s past, that act of Jesus’ love which brought new life to the world, comes down to us through the memory of others — witnesses — and is kept alive in that one remembering subject which is the Church. The Church is a Mother who teaches us to speak the language of faith. Saint John brings this out in his Gospel by closely uniting faith and memory and associating both with the working of the Holy Spirit, who, as Jesus says, "will remind you of all that I have said to you" ( Jn 14:26). The love which is the Holy Spirit and which dwells in the Church unites every age and makes us contemporaries of Jesus, thus guiding us along our pilgrimage of faith.
Source: Lumen Fidei (Vatican.va)