20. How had Peter come to this faith? And what is asked of us, if we wish to follow in his footsteps with ever greater conviction? Matthew gives us an enlightening insight in the words with which Jesus accepts Peter's confession: "Flesh and blood has not revealed this to you, but my Father who is in heaven" (16:17). The expression "flesh and blood" is a reference to man and the common way of understanding things. In the case of Jesus, this common way is not enough. A grace of "revelation" is needed, which comes from the Father (cf. ibid.). Luke gives us an indication which points in the same direction when he notes that this dialogue with the disciples took place when Jesus "was praying alone" (Lk 9:18). Both indications converge to make it clear that we cannot come to the fullness of contemplation of the Lord's face by our own efforts alone, but by allowing grace to take us by the hand. Only the experience of silence and prayer offers the proper setting for the growth and development of a true, faithful and consistent knowledge of that mystery which finds its culminating expression in the solemn proclamation by the Evangelist Saint John: "And the Word became flesh and dwelt among us, full of grace and truth; we have beheld his glory, glory as of the only Son from the Father" (1:14).