Today in Eastern Orthodox churches, the emphasis at this feast is on the shining forth and revelation of Jesus Christ as the Messiah and Second Person of the Trinity at the time of his baptism. It is also celebrated because, according to tradition, the baptism of Jesus in the Jordan River by St. John the Baptist marked one of only two occasions when all three Persons of the Trinity manifested themselves simultaneously to humanity: God the Father by speaking through the clouds, God the Son being baptized in the river, and God the Holy Spirit in the shape of a dove descending from heaven (the other occasion was the Transfiguration on Mount Tabor). Thus the holy day is considered to be a Trinitarian feast.