- THE FEAST OF PENTECOST OR HOLY TRINITY SUNDAY
“By the grace of the Most Holy Spirit, we have been vouchsafed to celebrate Holy Pentecost—the descent of the Holy Spirit. Jesus Christ said of this descent: Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter (that is, the Holy Spirit), will not come unto you; but if I depart, I will send him unto you. Howbeit when he, the Spirit of truth, is come, he will guide you into all truth. (Jn. 16:7, 13). This, His promise and benefit, is so great that we cannot even comprehend it: for the Lord promised to send not an Angel, not a man, but the Holy Spirit Himself.”
https://orthochristian.com/62250.html