O Lord, thou greatest and most true light, whence this light of the day and of the sun doth spring! O Light, which dost lighten every man that cometh into the world! O Light, which knowest no night nor evening, but art always a mid-day most clear and fair, without whom all is most dark darkness, by whom all be most resplendent! O thou wisdom of the eternal Father of Mercies, lighten my mind, that I may only see those things that please thee, and may be blinded to all other things. Grant that I may walk in thy ways, and that nothing else may be light and pleasant unto me. Lighten my eyes, O Lord, that I sleep not in death.