Trinity Sunday Prayer

(Andrei Rublev's "The Trinity" icon) 

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. 

(The Book of Common Prayer)