Pope John Paul II
Dominum et Vivificantem §23
Dominum et Vivificantem: On the Holy Spirit in the Life of the Church and the World
23 We find ourselves on the threshold of the Paschal events. The new, definitive revelation of the Holy Spirit as a Person who is the gift is accomplished at this precise moment. The Paschal events-the Passion, Death and Resurrection- of Christ-are also the time of the new coming of the Holy Spirit, as the Paraclete and the Spirit of truth. They are the time of the "new beginning" of the self- communication of the Triune God to humanity in the Holy Spirit through the work of Christ the Redeemer. This new beginning is the Redemption of the world: "God so loved the world that he gave his only Son." Already the "giving" of the Son, the gift of the Son, expresses the most profound essence of God who, as Love, is the inexhaustible source of the giving of gifts. The gift made by the Son completes the revelation and giving of the eternal love: the Holy Spirit, who in the inscrutable depths of the divinity is a Person-Gift, through the work of the Son, that is to say by means of the Paschal Mystery, is given to the Apostles and to the Church in a new way, and through them is given to humanity and the whole world.
Source: Dominum et Vivificantem (Vatican.va)