In the usage of the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite, the Great Doxology is one of the high points of the festal Matins service. The priest puts on his phelonion (chasuble). When it comes time for the Great Doxology the deacon opens the Holy Doors, and the priest raises his hands orans and exclaims: "Glory to Thee, Who hast shown us the Light!", and the choir begins chanting the Doxology, while all of the oil lamps and candles in the temple are lit. The Great Doxology concludes with the chanting of the Trisagion and leads into the chanting of the Troparion of the Day. If the bishop is present he vests in his full pontifical vestments for the Great Doxology, and the subdeacons stand behind the Holy Table (altar) holding the lit dikirion and trikirion.