The central formula (of the Christian faith) is not “I believe in something”, but “I believe in you.” It is the encounter with the man Jesus, and in this encounter it experiences the meaning of the world as a person. In Jesus’ life from the Father, in the immediacy and intensity of his converse with him in prayer and, indeed, face to face, he is God’s witness, through whom the intangible has become tangible, the distant has drawn near.

Joseph Ratzinger, Introduction to Christianity (Revised Edition), trans. J. R. Foster (San Francisco: Ignatius Press, 2004), page 79.