Today's Gospel (Jn 16:12-15):  Jesus said to his disciples, «I still have many things to tell you, but you cannot bear them now. When He, the Spirit of truth comes, He will guide you into the whole truth. He has nothing to say of himself, but He will speak of what He hears, and He will tell you of the things to come. He will take what is mine and make it known to you; in doing this, he will glorify me. All that the Father has is mine; because of this I have just told you, that the Spirit will take what is mine and make it known to you».

Today, we celebrate the solemnity of the mystery at the center of our faith, where everything originates from and where everything returns to. The mystery of the unity and of God, and at the same time, his subsistence in three equal and yet, different Persons. The Father, the Son and the Holy Spirit: unity in communion and communion in unity. In this great day, we must realize that his great mystery is ever present in our lives: from the very Sacrament of our Baptism —which we have received in the name of the Holy Trinity— till our participation in the mystery of the Eucharist, which is made for the glory of the Father, by his Son Jesus Christ, thanks to the Holy Spirit. And it is also the signal by which we Christians recognize one another: the sign of the Cross, in the name of the Father, and of the Son and of the Holy Spirit.

The mission of the Son, Jesus Christ, consists in the revelation of his Father, whom He is the perfect image of, and in the gift of the Spirit, which has also been revealed by the Son. Today, the proclaimed evangelic reading shows it up to us: the Son receives everything from the Father in perfect unity: «All that the Father has is mine», and the Spirit receives all that the Spirit is from the Father and the Son. «Because of this —says Jesus— I have just told you, that the Spirit will take what is mine and make it known to you» (Jn 16:15). And in another part of this same chapter (Jn 15:26): «When the Counselor comes, whom I will send to you from the Father, the Spirit of truth who goes out from the Father, He will testify about me».

From all that, let us learn the great and comforting truth: the Holy Trinity, far from being distant and aloof, comes to us, dwells within us and transforms us in its interlocutors. And this, through the Spirit, which guide us into the whole truth (cf. Jn 16:13). The incomparable “Christian dignity”, which, St. Leo the Great, at times, speaks about, is this: to keep God's mystery within us and, thus, revel in our Earth of our own Heavenly “citizenship” (cf. Phil 3:20), that is, into the Holy Trinity's bosom.