Today is a lesser known yet important Sunday in the church calendar named simply TRINITY SUNDAY. It is a day to celebrate something of the mystery of God as we confess with Christian churches of all time that our one God is three persons. As it speaks to the mystery of God, it is sometimes helpful for us to think more concretely of the primary (but not exclusive) work of each person.
We think of God the Father as he creates and sustains the universe ("He’s got the whole world in his hands"), God the Son who came to rescue and save the world through his death and resurrection (the events of Good Friday and Easter), and God the Holy Spirit, who lives in us and gives us comfort, counsel and power (the wind and fire of Pentecost Sunday).
The WORSHIP SOURCEBOOK (Faith Alive) offers this helpful summary: "While every Christian worship service is a celebration of the Trinity, Trinity Sunday focuses explicitly on the mystery, power, and beauty of the triune God. Our Christian identity and mission are given to us as we are baptized in the name of the Father, the Son, and the Holy Spirit (Matt. 28:19). Our worship is not only directed to the triune God but is also enabled by the prompting of the Holy Spirit and the mediation of Jesus Christ. At its best, our worship is also an expression of the unity and common purpose of the church, which Jesus prayed would reflect the unity between himself and God (John 17:20-21)" (p.719). - EGN