books.google.com - In this study on evening worship in the Orthodox Church, Nicholas Uspensky reveals the true purpose for which the service of Vespers came into existence: the ancient Christian tradition of giving thanks for the evening light, and the faith which this tradition implies concerning the presence of Christ...http://books.google.com/books/about/Evening_Worship_in_the_Orthodox_Church.html?id=dmjQhWlKqqsC&utm_source=gb-gplus-shareEvening Worship in the Orthodox Church
