Yours is the Day, Yours is the Night

Yours is the day, O Lord,
and yours is the night.
Let your Sun of righteousness
remain in our hearts
to drive away the darkness
of wicked thoughts;
through Jesus Christ our Lord.

Source: Gelasian Sacramentary

Source of this version: Freely modified from  Ancient Collects, and Other Prayers, ed. William Bright, 1902, p. 10 #4

Graphic, Gelasian Sacramentary, from Wikipedia.com