The first reading is from the Acts of the Apostles. On Pentecost (meaning fifty days after the feast of the Resurrection of Jesus by Christians), when the Spirit fills the disciples, it gives them new languages to preach about Jesus. This is the official birthdate of the Church. For this reason, today the entire Church celebrates the great Feast of Pentecost, the coming of the Holy Spirit, and the pouring out of His graces and benefits on all the baptized. The Church will be universal in scope. People of every nation will be invited to join this new People of God.