The Great Doxology is an ancient hymn of praise to the Trinity which is chanted or read daily in the Eastern Orthodox and Greek-Catholic Churches. The hymn is based on Luke 2:14 in which the angelic host appears to the shepherds and announces to them the Nativity of Christ. The hymn also incorporates verses from Psalm 145:2 and Psalm 119:12. The hymn is one of the most famous liturgical exclamations of praise (doxology) in the history of the Christian Church. As currently used, the hymn is found in several different forms: