
The first reading provides us with the actual event of the Pentecost event. The feast of Pentecost at the time of Jesus came to celebrate two events: thanksgiving for the upcoming harvest and the receiving of the Law at Mount Sinai. This feast was one of the major pilgrimage festivals where Jews throughout the Mediterranean region came to Jerusalem for the festival. On this particular celebrations, the disciples receive the Holy Spirit in a great gust of wind and tongues of fire. They begin to speak to the crowds, and each one heard the disciples in their own particular language. This event accomplished what the Old Law was incapable of doing - restoring the unity of humankind that was lost at Babel. Just as our communication became distorted and divided at the fall of the tower of Babel, so the world's unity is restored by the work of the Holy Spirit.
What is more, this revelation is given publicly to the whole world; it is not a private affair as was the giving of the Law to Moses. The New Law is intended for the whole world and none are exempted from it. As the Catechism states: "On that day, the Holy Spirit is fully revealed. Since that day, the Kingdom announced by Christ has been open to those who believe in him: the in the humility of the flesh and in faith, they already share in the communion of the Holy Trinity. By his coming, which never ceases, the Holy Spirit causes the world to enter into the 'last days,' the time of the Church, the Kingdom already inherited though not yet consummated." (CCC #732).
Paul references this inheritance in the second reading from the letter to the Romans. The Holy Spirit gives us the spirit of adoption that enables us to cry out, "Abba - Father" - and so we come to inherit eternal life. Adoption was a very different arrangement in the ancient world than it is today. In those days a father could disinherit his natural born sons, but he could not disinherit an adopted child. An adopted son was forever protected legally in this arrangement. By way of example, Octavian (Caesar Augustus) was the adopted son of Julius Caesar, and Tiberias was the adopted son of Caesar Augustus; the Romans used adoption to pass on inheritance of the throne so as to avoid civil wars. In any case, the point of Paul's use of the term is to point out the permanent character of the Christian's inheritance and the immense responsibility we have in cherishing it.
This permanence is also reflected in the Gospel reading where Jesus refers to the Spirit as our Advocate, a legal term referring to a legal representative before a court. The promise of an advocate was a reassuring one to the disciples because in the Jewish scriptures no advocate was present before the throne of God to defend humankind. Recall the story of Job where Satan advocates against Job before God's court. No one is there to represent Job; he is utterly defenseless. The same is true of daughter Zion in the book of Lamentations. However, in the new world order of Christ we have an advocate to defend our cause before God. We are not defenseless; we are not alone in the universe. We have the consolation of the Holy Spirit in the new age of the Church.
The same Spirit who drove Jesus into the desert and then into his public ministry drove the disciples to proclaim the death and resurrection of Jesus and to perform works of justice and charity for the sake of others. May the Holy Spirit drive us to the same ministry of Jesus and the Church throughout the ages as we pray the words of the opening prayer for the feast of Pentecost: "God our Father, let the Spirit you sent on your Church to begin the teaching of the gospel continue to work in the world through the hearts of all who believe. Amen."