Pentecost: "He is the speech of God become a person"

The Spirit whom the Son sends to us from the Father on Pentecost is the Spirit of the eternal dialogue of love between Father and Son.  He is the speech of God become a person.  We are introduced into this language; until now it had been for us a mysterious foreign language, but when the tongues of fire came down upon the Church it became our real "mother tongue".  The first word which we, as children of God, learn to stammer in it is the word "Abba!".

Hans Urs von Balthasar The Threefold Garland.