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.
Almighty God, we invoke Thee, the fountain of everlasting light, and entreat Thee to send forth Thy truth into our hearts, and to pour upon us the glory of Thy brightness; through Jesus Christ our Lord. Amen.