A historical English prayer collected in Prayers of the Middle Ages: Light from a Thousand Years, edited by J. Manning Potts.
Historical edition. Historical claims and instructions are preserved as historical context.
O God, who hast bidden us to worship Thee in spirit and in truth, shadow us with the power of Thy Holy Spirit—let Thy mercy and the promised grace of Thy salvation come upon us, that our prayer may be directed unto Thee by Him, through whom we believe our sins to be forgiven.