The Holy Spirit is God of the same substance and essence as the Father and Son. These three persons constitute the one God we believe in. To see the Holy Spirit would be to see God’s essence, face to face. This is the beatific vision which is not granted to us in this life but which we hope to attain in the next life in heaven. In the book of Exodus, Moses asked God to show him His glory. But the Lord answered "you cannot see my face, for no one can see me and live.(33: 20). Without a very special grace from God such as what some fathers and doctors of the Church say was giving to St Paul when he was caught up to the third heaven, we cannot see God face to face in this life.
During the time in which Paul lay prostrate up
on the earth, he was entirely renewed by sanctifying
grace and other infused gifts, restored and illumined pro
portionately in all his interior faculties,
and thus he was
prepared to be elevated to the empyrean heaven, which is
called the third heaven. He himself confesses, that he
did not know whether he was thus elevated in body or only
in spirit (I Cor. 12, 4). But there, by more than ordi
nary vision, though in a transient manner, he saw the
Divinity clearly and intuitively. Besides the being of
God and his attributes of infinite perfection, he recog
nized the mystery of the Incarnation and Redemption,
and all the secrets of the law of grace and of the state
of the Church. He saw the peerless blessing of his justi
fication and of the prayer of saint Stephen for him ; and
still more clearly was he made aware of the prayers of
the most holy Mary and how his conversion had been
hastened through Her; and that, after Christ, her merits
had made him acceptable in the sight of God. From
that hour on he was filled with gratitude and with deep
est veneration and devotion to the great Queen of heaven,
whose dignity was now manifest to him and whom he
thenceforth acknowledged as his Restorer.
From the
Mystical City of God by Sister Mary of Agreda