The day of Pentecost is one of the few days on which we talk about the Holy Spirit. Lutherans tend to turn our focus away from the power of the Spirit to Jesus. Why is that? Why don't we focus as much on him?
Jesus describes the Holy Spirit's job in John 15 and 16. The Spirit is a helper. He reveals Jesus' message to people. He only says what is given to him. See a pattern? The Holy Spirit's whole job is to get out of the way. His job is to point us to Jesus and strengthen our faith.