A prayer from St. Ambrose:

O God, creation’s secret force,
Thyself unmoved, all motion’s source,
Who from the morn til evening ray,
Through all its changes guidest the day.

Come, Holy Ghost, with God the Son,
And God the Father, ever one;
Shed forth Thy grace within our breast,
And dwell with us a ready guest.

By every power, by heart and tongue,
By act and deed, Thy praise be sung;
Inflame with perfect love each sense,
That others’ souls may kindle thence.

O Father, that we ask be done
Through Jesus Christ, Thine only Son.
Who, with the Holy Ghost, and Thee
Still live and reign eternally.