The Sending of the Spirit
The Holy Spirit will descend upon the Apostles and become present within them after some new fashion in which he was not there before. “Because you are his children God has sent into your hearts the spirit of his Son whereby you cry Abba: Father” (Gal 4:6). From the beginning the Holy Spirit had been within them; now his presence there is new and productive of new effects.
By God’s indwelling, then, effected by grace, the Holy Spirit now is present in the soul differently from the way in which he is present by creation. By creation he is wholly everywhere yet more in the higher forms than in the lower, for he is able to express more of himself in them. Among these highest forms of visible creation namely, man, there are again degrees of his presence so that even among men he is more in one than in another. This gradation is in proportion to their grace. The more holy and sanctified they become, the more does the Holy Spirit dwell in them, the more fully is he sent, the more completely given, while the Book of Wisdom says expressly that God does not dwell in sinners. As soon as I am in a state of grace the Holy Spirit dwells in me in this new and wonderful way, takes up his presence in me in this new fashion. It is precisely then, by our faith and hope and love that this is effected, so that the individual soul under God’s own movement does help on this union of God and man. In all the rest of creation God is present by his action; in the souls of the just it is true to say that he is present by theirs.