Almighty and everlasting God,
in Christ you have revealed your glory among the nations.
Preserve the works of your mercy,
that your Church throughout the world
may persevere with steadfast faith
in the confession of your name;
through your Son, Jesus Christ, our Lord.
Source: Gelasian Sacramentary
Source of this version: http://www.plts.edu/docs/jacobson/pentecost_2006.pdf
Also found here: The Catholic Prayer Book, © 1986 Servant Books, Cincinnati OH