O Lord Jesus Christ, King of glory,
you ascended through the eternal gates to your Father’s throne
and opened the kingdom of heaven to all believers.
Since you reign in heaven,
help us not to be bound to things of this earth,
but lift our hearts where you, our redeemer, have gone before;
you live and reign with the Father and the Holy Spirit,
one God, now and forever.
Source: Mozarabic Sacramentary
Also found here: A Lutheran Prayer Book, ed. Doberstein, © 1960 Muehlenberg Press, Philadelphia
The opening lines of the prayer are loosely quoting the Te Deum Laudamus.