I based the ending of my book on this, and hence, my title,

In the New Testament, a brief hymn of praise sung by the aged Simeon, who had been promised by the Holy Spirit that he would not die until he had seen the Messiah. Simeon was at the Temple in Jerusalem when Mary and Joseph came to present the infant Jesus for the rite of purification according to Jewish law and custom.  Simeon recognized the baby as the promised Saviour, took him in his arms, and raised his hymn of praise.  Found in Luke 2:29-32, it is called the Nunc Dimittis for its first words in the Latin of the Vulgate Bible:  Nunc dimittis servum tuum, Domine, secundum verbum tuum, in pace, "Now, Master, you can let your servant go in peace, just as you promised."  Because of its implications of fulfillment, peace,and rest, the early church viewed it as appropriate for the ending of the day.  Since the 4th century it has been used in such evening worship services as Compline, Vespers, and Evensong.