On the Liturgical Calendar today, the Church celebrates the Feast Day of the Baptism of Our Lord. Below is the conclusion of a three part kontakion written by Saint Romanus, the Melodist, in the 6th century. It was written and sung to commemorate this holy event.
Checking my handy encyclopedia, I find that a kontakion is a poetic homily, or sermon, consisting of 18 to 30 stanzas. The stanzas are chanted, and all follow the structural pattern set by the first model stanza. A refrain links all stanzas together. It is believed that a soloist sang the main stanzas, and the choir responded by singing the refrain.

Enjoy these verses comprising the words and thoughts that the writer ascribes to St. John the Baptist on this holy occasion.
Kontakion on the Theophany -- the Baptism of Christ (conclusion)
After these dread words the offspring of Zachary cried to the Creator, “I hesitate no longer, but do what you command me.” Having said this, he approached the Savior as a slave his lord. He gazed at him, looking devoutly at the naked limbs of the one who orders the clouds to envelop the heavens like a garment, and again he contemplated in the midst of the streams the one who appeared in the midst of the three youths, dew in the fire and fire in the Jordan shining, gushing, the unapproachable Light.
But, seeing these wonders, the son of the priest in the office of a priest stretches out his palm and lays his hand on Christ as he cries to those who see it, “See in the Jordan the willing rain. Contemplate the torrent of delights, as it is written, in the streams of the waters, a great sea in a river. Let no one then consider me daring. I act, not as foolhardy, but as a servant. He is Lord and he told me to do this; that is why I am baptizing the unapproachable Light.”
“I was feeble as a mortal, but he as God of all gave me power, crying, `Place your hand on me and I will give it strength.’ For how could I have done it, had this not been what he said and what came to pass? How would I have had the power to baptize the deep, I who am clay, had I not first received and accepted power from on high? For now, with his standing by me, I sense that I am more than I was before. I am something else. I have been changed, I have been glorified, for I am seeing, I am baptizing the unapproachable Light.”
“I no longer say as before, `I may not loose the strap of his sandals,’ for see, I advance from the feet to the head. I tread no longer the earth but heaven itself, for what I accomplish is of heaven. Rather I have surpassed the things on high, for they carry, but do not see whom they carry, while I both see and baptize. Heaven rejoice and earth be glad, springs of waters be hallowed, for by appearing he has filled all things with blessing, he enlightens all mankind, the unapproachable Light.”
At the divine command, Zachary’s offspring raises his mind on high, and stretching out his palm places it on the King, washes in the streams, then leads back to land the Lord of land and sky, whom the One who cried, “This is my beloved Son” pointed out from heaven by a voice as by a finger. To the Father himself, then, and to the Son who was baptized and to his Spirit I cry, “Crush those who afflict my soul; end my errors, my Redeemer, the unapproachable Light.”
The complete kontakion can be viewed in sequence here.