The Baptism of the Lord has historically been associated with the celebration of Epiphany. Even today, the Eastern Christian feast of Theophany, celebrated on January 6 as a counterpart to the Western feast of Epiphany, focuses primarily on the Baptism of the Lord as the revelation of God to man.
A blessed Feast of the Theophany of Our Lord and Saviour Jesus Christ.
Reading from the Synaxarion:
About the beginning of our Lord’s thirtieth year, John the Forerunner, who was some six months older than Our Saviour according to the flesh, and had lived in the wilderness since his childhood, received a command from God and came into the parts of the Jordan, preaching the baptism of repentance unto the remission of sins.
Then our Saviour also came from Galilee to the Jordan, and sought and received baptism though He was the Master and John was but a servant.
Whereupon, there came to pass those marvellous deeds, great and beyond nature: the Heavens were opened, the Spirit descended in the form of a dove upon Him that was being baptized and the voice was heard from the Heavens hearing witness that this was the beloved Son of God, now baptized as a man (Matt. 3:13-17; Mark 1:9-11; Luke 3:1-22).
From these events the Divinity of the Lord Jesus Christ and the great mystery of the Trinity were demonstrated. It is also from this that the present feast is called “Theophany,” that is, the divine manifestation, God’s appearance among men.
On this venerable day the sacred mystery of Christian baptism was inaugurated; henceforth also began the saving preaching of the Kingdom of the Heavens.
Apolytikion in the First Tone
Lord, when You were baptized in the Jordan, the veneration of the Trinity was revealed. For the voice of the Father gave witness to You, calling You Beloved, and the Spirit, in the guise of a dove, confirmed the certainty of His words. Glory to You, Christ our God, who appeared and enlightened the world.Source: http://byzantiumonbrew.wordpress.com/2014/01/05/theophany/
Baptism of Our Lord
Jesus did not need to be baptized.He was without sin.Even John said in Matthew 3,
Then Jesus came from Galilee to John at the Jordan to be baptized by him. 14* John tried to prevent him, saying, “I need to be baptized by you, and yet you are coming to me?” 15Jesus said to him in reply, “Allow it now, for thus it is fitting for us to fulfill all righteousness.” Then he allowed him. 16* j After Jesus was baptized, he came up from the water and behold, the heavens were opened [for him], and he saw the Spirit of God descending like a dove [and] coming upon him. 17And a voice came from the heavens, saying, “This is my beloved Son,* with whom I am well pleased.”
Jesus' baptism sanctified the water and showed us the importance of Baptism for the remission of sin.After Jesus was baptized by John He went out with the apostles and baptized.Jesus showed Himself to be God(Trinity)