The Dialogue of St. Catherine of Siena

"When My only-begotten Son returned to Me, forty days after the resurrection, this Bridge, namely Himself, arose from the earth, that is, from among the conversation of men, and ascended into Heaven by virtue of the Divine Nature and sat at the right hand of Me, the Eternal Father, as the angels said, on the day of the Ascension, to the disciples, standing like dead men, their hearts lifted on high, and ascended into Heaven with the wisdom of My Son -- 'Do not stand here any longer, for He is seated at the right hand of the Father!' When He, then, had thus ascended on high, and returned to Me the Father, I sent the Master, that is the Holy Spirit, who came to you with My power and the wisdom of My Son, and with His own clemency, which is the essence of the Holy Spirit. He is one thing with Me, the Father, and with My Son. And He built up the road of the doctrine which My Truth had left in the world. Thus, though the bodily presence of My Son left you, His doctrine remained, and the virtue of the stones founded upon this doctrine, which is the way made for you by this Bridge. For first, He practiced this doctrine and made the road by His actions, giving you His doctrine by example rather than by words; for He practiced, first Himself, what He afterwards taught you, then the clemency of the Holy Spirit made you certain of the doctrine, fortifying the minds of the disciples to confess the truth, and to announce this road, that is, the doctrine of Christ crucified, reproving, by this means, the world of its injustice and false judgment, of which injustice and false judgment, I will in time discourse to you at greater length."

-From the Dialogue of St. Catherine of Siena