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On May 31st the Holy Orthodox Church celebrates Trinity Sunday also known as Pentecost in which the Church remembers the descent of the Holy Spirit upon the Apostles as heard in Acts 2:1-4 “When the Day of Pentecost had fully come, they were all with one accord in one place. And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them. And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.” This feast day is called Pentecost because the Holy Spirit descended on the Apostles on the fiftieth day after the Resurrection of Jesus Christ and it is called Holy Trinity Day because from this day the action of the Holy Trinity was revealed to the world and people learned to venerate and glorify the three Persons of the one God, the Father and Son and Holy Spirit.