O Eternal Wisdom, grant me the light of Thy Holy Spirit, that I may know what Thou wouldest have me do; I offer myself entirely to Thee, do with me what seemeth good in Thy sight; not my will, but Thine, be done. Correct whatsoever Thou seest amiss in me. strengthen my weak resolutions, restrain my wayward desires; remove all hindrances to the fulfilment of Thy will, and give me grace so to follow the leadings of Thy Providence, that my life may be spent to Thy honor and glory, in whatsoever way it pleases Thee—Amen.

Treasury of Devotion

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 Christ our Lord-Amen.

Sarum Breviary, 1085