This Sunday was Trinity Sunday in the RCL and BCP lectionary cycles (the BCP readings are here).
What a theme topic for a Sunday in a non-institutional Church of Christ congregation! This key doctrine, rich in implications for the life of the Church, is terribly neglected among us (we hesitate to even use the "T" word, preferring instead to speak vaguely about the "Godhead"). It was extremely difficult to put together: my time was limited, having just returned from vacation and I was unable to read very much before putting the service together. The readings were provided, I sprinkled in a few interpretive comments for flow, but we have no hymns that speak of the Trinity directly, so I settled for a handful of hymns that include references to the Father, Son and Holy Spirit ("Holy, Holy, Holy!" and the Doxology plus a new hymn [for us] entitled "Father, In Whom We Live").
Almighty and everlasting God, you have given to us your servants grace, by the confession of a true faith, to acknowledge the glory of the eternal Trinity, and in the power of your divine Majesty to worship the Unity: Keep us steadfast in this faith and worship, and bring us at last to see you in your one and eternal glory, O Father; who with the Son and the Holy Spirit live and reign, one God, for ever and ever. Amen.