Dominum et Vivificantem §15

¹⁵ There is also accomplished in its entirety the mission of the Messiah, that is to say of the One who has received the fullness of the Holy Spirit for the Chosen People of God and for the whole of humanity. "Messiah" literally means "Christ," that is, "Anointed One," and in the history of salvation it means "the one anointed with the Holy Spirit." This was the prophetic tradition of the Old Testament. Following this tradition, Simon Peter will say in the house of Cornelius: "You must have heard about the recent happenings in Judea...after the baptism which John preached: how God anointed Jesus of Nazareth with the Holy Spirit and with power." From these words of Peter and from many similar ones, one must first go back to the prophecy of Isaiah, sometimes called "the Fifth Gospel" or "the Gospel of the Old Testament." Alluding to the coming of a mysterious personage, which the New Testament revelation will identify with Jesus, Isaiah connects his person and mission with a particular action of the Spirit of God-the Spirit of the Lord. These are the words of the Prophet: "There shall come forth a shoot from the stump of Jesse, and a branch shall grow out of his roots. And the Spirit of the Lord shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and the fear of the Lord. And his delight shall be the fear of the Lord." This text is important for the whole pneumatology of the Old Testament, because it constitutes a kind of bridge between the ancient biblical concept of "spirit," understood primarily as a "charismatic breath of wind," and the "Spirit" as a person and as a gift, a gift for the person. The Messiah of the lineage of David ("from the stump of Jesse") is precisely that person upon whom the Spirit of the Lord "shall rest." It is obvious that in this case one cannot yet speak of a revelation of the Paraclete. However, with this veiled reference to the figure of the future Messiah there begins, so to speak, the path towards the full revelation of the Holy Spirit in the unity of the Trinitarian mystery, a mystery which will finally be manifested in the New Covenant.