This hymn is used for Matins/Office of Readings on the Solemnity of the Ascension in both Forms.
O Thou eternal King most high!
Who didst the world redeem;
And conquering Death and Hell, receive
A dignity supreme.
Thou, through the starry orbs, this day,
Didst to thy throne ascend;
Thenceforth to reign in sovereign power,
And glory without end.
There, seated in thy majesty,
To Thee submissive bow
The Heav’n of Heav’ns, the spacious earth,
The depths of Hell below.
With trembling there the angels see
The chang’d estate of men;
The flesh which sinn’d by Flesh redeem ‘d;
Man in the Godhead reign.
There, waiting for thy faithful souls,
Be Thou to us, O Lord!
Our peerless joy while here we stay,
In Heav’n our great reward.
Renew our strength; our sins forgive;
Our miseries efface;
And lift our souls aloft to Thee,
By thy celestial grace.
So, when Thou shinest on the clouds,
With thy angelic train,
May we be sav’d from vengeance due,
And our lost crowns regain.
Glory to Jesus, who returns
Triumphantly to Heaven;
Praise to the Father evermore,
And Holy Ghost be given.
Words: Anon. Latin, 10th C.; tr. Fr. Edward Caswall, C.O., 1849.
The original Latin text of this hymn may be found here.