Dominum et Vivificantem §8

⁸ It is a characteristic of the text of John that the Father, the Son and the Holy Spirit are clearly called Persons, the first distinct from the second and the third, and each of them from one another. Jesus speaks of the Spirit-Counselor, using several times the personal pronoun "he"; and at the same time, throughout the farewell discourse, he reveals the bonds which unite the Father, the Son and the Paraclete to one another. Thus "the Holy Spirit . . .proceeds from the Father" and the Father "gives" the Spirit. The Father "sends" the Spirit in the name of the Son, the Spirit "bears witness" to the Son. The Son asks the Father to send the Spirit-Counselor, but likewise affirms and promises, in relation to his own "departure" through the Cross: "If I go, I will send him to you," Thus, the Father sends the Holy Spirit in the power of his Fatherhood, as he has sent the Son ; but at the same time he sends him in the power of the Redemption accomplished by Christ-and in this sense Holy Spirit is sent also by the Son: "I will send him to you." Here it should be noted that, while all the other promises made in the Upper Room foretold the coming of the Holy Spirit after Christ's departure, the one contained in the text of John 16:7f. also includes and clearly emphasizes the relationship of interdependence which could be called causal between the manifestation of each: "If I go, I will send him to you." The Holy Spirit will come insofar as Christ will depart through the Cross: he will come not only afterwards, but because of the Redemption accomplished by Christ, through the will and action of the Father.