The Universal Church celebrates Sunday, May 24, 2015 as Pentecost Sunday in the liturgical year B. In the entrance antiphon, we pray: “The Spirit of the Lord has filled the whole world and that which contains all things understands what is said. Alleluia.” Pentecost comes from the Greek word for fiftieth day. It is fifty days since our Lord rose from the dead. Ten days ago, we celebrated His ascension into heaven. Before going up to his Father, Christ asked his disciples, as we hear in Acts 1: 4, not to leave Jerusalem but to wait there until he sent them his Advocate, the Holy Spirit, to strengthen their faith and send them preaching his word to the four corners of the world.