From Dom Guéranger's The Liturgical Year.

While honouring the first successor of St. Peter, Rome commemorates the protomartyr of the female sex. Together with holy Church, then, let us unite in the concert of praise unanimously lavished upon Thecla by the fathers of east and west. When the martyr pontiff Methodius gave his ‘Banquet of virgins’ to the Church, about the end of the third century, it is on the brow of the virgin of Iconium that he placed the fairest of the crowns distributed at the banquet of the Spouse. And justly so; for had not Thecla been trained by Paul, who had made her more learned in the Gospel than she was before in philosophy and every science? Heroism in her kept pace with knowledge; her magnanimity of purpose was equalled by her courage; while, strong in the virginal purity of her soul and body, she triumphed over fire, wild beasts, and sea monsters, and won the glory of a triple martyrdom.

A fresh triumph is hers at the mysterious banquet. Wisdom has taken possession of her, and, like a divine harp, makes music in her soul, which is echoed on her lips in words of wondrous eloquence and sublime poetry. When the feast is over, and the virgins rise to give thanks to the Lord, Thecla leads the chorus, singing:

For thee, O Bridegroom,
I keep myself pure;
and with burning lamp I come to meet thee.

I have fled from the bitter pleasures of mortals,
and the luxurious delights of life and its love;
under Thy life-giving arms I desire to be protected,
and to gaze for ever on Thy beauty, O blessed One.

For Thee, O Bridegroom,
I keep myself pure;
and with burning lamp I come to meet Thee.

I have contemned union with mortal man;
I have left my golden home for Thee, O King;
I have come in undefiled robes,
that I may enter with Thee into Thy happy bridal chamber.

For Thee, O Bridegroom,
I keep myself pure;
and with burning lamp I come to meet Thee.

Having escaped the enchanting wiles of the serpent,
and triumphed over the flaming fire
and the attacks of wild beasts,
I await Thee from heaven.

For Thee, O Bridegroom,
I keep myself pure;
and with burning lamp I come to meet Thee.

Through love of Thee, O Word, I have forgotten the land of my birth;
I have forgotten the virgins my companions,
and even the desire of mother and of kindred;
for Thou, O Christ, art all things to me.

For Thee, O Bridegroom,
I keep myself pure;
and with burning lamp I come to meet Thee.[1]

Prayer

Da, quæsumus, omnipotens Deus: ut qui beatæ Theclæ virginis et martyris tuæ natalitia colimus, et annua soleranitate lætemur, et tantæ fidei proficiamus exemplo. Per Dominum.
Grant, we beseech thee, almighty God, that we, who celebrate the festival of blessed Theda, thy virgin and martyr, may rejoice in her annual solemnity, and make progress by the example of such great faith. Through our Lord.

[1] Method. Conviv. dec. virg. vii, viii, xi.