On this day we recall that just 50 days after the Glorious Resurrection, the Holy Spirit came upon the Holy Apostles and all those gathered with them in a new and different way. For the first time, the Holy Spirit actually took up residence within the human soul.
Before this the Spirit of God would descend upon a person for various reasons – such as when one of the prophets was inspired to speak or write or act in a particular way so that God’s will might be made known to His people, but He did not make His abode within their soul. But something new happened at Pentecost, something wondrous, something marvelous – God came and dwelt not only among us as our Lord Jesus Christ, but within us through the Holy Spirit. The promise of our salvation that we would be united with God, began to be made manifest.