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What Happened at Pentecost?

Fifty days after the Resurrection at Pentecost the glorified Jesus Christ poured out the Spirit in abundance and revealed him as a divine Person so that the Holy Trinity was fully manifest. The mission of Christ and of the Spirit became the mission of the Church which is sent to proclaim and spread the mystery of the communion of the Holy Trinity.

We have seen the true Light, we have received the heavenly Spirit, we have found the true faith: we adore the indivisible Trinity, who has saved us. (Byzantine Liturgy, Troparion of Vespers of Pentecost)

What does the Spirit do in the Church?

The Spirit builds, animates and sanctifies the Church. As the Spirit of Love, he restores to the baptized the divine likeness that was lost through sin and causes them to live in Christ the very life of the Holy Trinity. He sends them forth to bear witness to the Truth of Christ and he organizes them in their respective functions so that all might bear the "fruit of the Spirit." (Galatians 5:22)

From the Compendium of the Catechism of the Catholic Church

Blessed Pentecost to all readers!

Image from St. Charles Borromeo Church