O Jordan River, why wast thou astonished at beholding the Invisible naked? And he answereth, saying, I beheld Him and trembled; for how shall I not tremble and fear, when the angels trembled at sight of Him, heaven was astounded, earth was encompassed by trepidation, and the sea was bashful, with all things visible and invisible; for Christ hath appeared in the Jordan to bless the waters.
He that encompasseth the heavens with clouds putteth on today the courses of the Jordan; and He that lifteth the sin of the world, cleanseth and purifieth me. Yea, the Spirit hath testified of Him from on high that He is the only Son of the Father on high. Let us, therefore, shout to Him, crying, O Thou Who didst appear and save us, glory to Thee.
Metropolitan Joseph's Pastoral Message for the Feast
Read Fr. Ayman Kfouf's Theophany Reflection 
Listen to Fr. Thomas Hopko on the Feast of Theophany
The Baptism of Our Lord  by Archpriest A. Narushevich
Epiphany: The Celebration of Life  by Fr. Antony Gabriel
A Theophany Within  by Fr. George Morelli
More essays on the season between Nativity and Theophany