Saint Paul, The Apostle to the Nations

Paul, the chosen vessel of Christ, the glory of the Church, the Apostle of the Nations and teacher of the whole world, was a Jew by race, of the tribe of Benjamin, having Tarsus as his homeland. He was a Roman citizen, fluent in the Greek language, an expert in knowledge of the Law, a Pharisee, born of a Pharisee, and a disciple of Gamaliel, a Pharisee and notable teacher of the Law in Jerusalem. For this cause, from the beginning, Paul was a most fervent zealot for the traditions of the Jews and a great persecutor of the Church of Christ; at that time, his name was Saul (Acts 22:3-4). In his great passion of rage and fury against the disciples of the Lord, he went to Damascus bearing letters of introduction from the high priest. His intention was to bring the disciples of Christ back to Jerusalem in bonds. As he was approaching Damascus, about midday there suddenly shone upon him a light from Heaven. Falling on the earth, he heard a voice saying to him, "Saul, Saul, why persecutest thou Me?" And he asked, "Who art Thou, Lord?" And the Lord said, "I am Jesus Whom thou persecutest; it is hard for thee to kick against the pricks." And that heavenly voice and brilliance made him tremble, and he was blinded for a time. He was led by the hand into the city, and on account of a divine revelation to the Apostle Ananias (see Oct. 1), he was baptized by him, and both his bodily and spiritual eyes were opened to the knowledge of the Sun of Righteousness. And straightway- O wondrous transformation! - beyond all expectation, he spoke with boldness in the synagogues, proclaiming that "Christ is the Son of God" (Acts 9:1-21). As for his zeal in preaching the Gospel after these things had come to pass, as for his unabating labors and afflictions of diverse kinds, the wounds, the prisons, the bonds, the beatings, the stonings, the shipwrecks, the journeys, the perils on land, on sea, in cities, in wildernesses, the continual vigils, the daily fasting, the hunger, the thirst, the nakedness, and all those other things that he endured for the Name of Christ, and which he underwent before nations and kings and the Israelites, and above all, his care for all the churches, his fiery longing for the salvation of all, whereby he became all things to all men, that he might save them all if possible, and because of which, with his heart aflame, he continuously traveled throughout all parts, visiting them all, and like a bird of heaven flying from Asia and Europe, the West and East, neither staying nor abiding in any one place - all these things are related incident by incident in the Book of the Acts, and as he himself tells them in his Epistles.

His Epistles, being fourteen in number, are explained in 250 homilies by the divine Chrysostom and make manifest the loftiness of his thoughts, the abundance of the revelations made to him, the wisdom given to him from God, wherewith he brings together in a wondrous manner the Old with the New Testaments, and expounds the mysteries thereof which had been concealed under types; he confirms the doctrines of the Faith, expounds the ethical teaching of the Gospel, and demonstrates with exactness the duties incumbent upon every rank, age, and order of man. In all these things his teaching proved to be a spiritual trumpet, and his speech was seen to be more radiant than the sun, and by these means he clearly sounded forth the word of truth and illumined the ends of the world. Having completed the work of his ministry, he likewise ended his life in martyrdom when he was beheaded in Rome during the reign of Nero, at the same time, some say, when Peter was crucified.

The Feastday of St Paul is celebrated on June 29th,  Peter and Paul - The Holy Apostles.

Apolytikion in the Fourth Tone / Ἀπολυτίκιον Ἦχος δ’.
Your voice resounded throughout the world that received your word by which, in godly manner, you taught dogma, clarified the nature of beings, and set in order the character of people. Venerable father, Royal Priesthood, intercede to Christ God to grant us great mercy.

Οἱ τῶν Ἀποστόλων πρωτόθρονοι, καὶ τῆς Οἰκουμένης διδάσκαλοι, τῷ Δεσπότῃ τῶν ὅλων πρεσβεύσατε, εἰρήνην τῆ οἰκουμένῃ δωρήσασθαι, καὶ ταῖς ψυχαῖς ἡμῶν τὸ μέγα ἔλεος.

Kontakion in the Fourth Tone / Κοντάκιον Ἦχος β’.
For the Church art thou in truth a firm foundation, granting an inviolate lordship unto all mortal men and sealing it with what thou hast taught, O righteous Basil, revealer of heavenly things.

Τοὺς ἀσφαλεῖς καὶ θεοφθόγγους κήρυκας, τὴν κορυφὴν τῶν Μαθητῶν σου Κύριε, προσελάβου εἰς ἀπόλαυσιν, τῶν ἀγαθῶν σου καὶ ἀνάπαυσιν, τοὺς πόνους γὰρ ἐκείνων καὶ τὸν θάνατον, ἐδέξω ὑπὲρ πᾶσαν ὁλοκάρπωσιν, ὁ μόνος γινώσκων τὰ ἐγκάρδια.

Source: Greek Orthodox Archdiocese of America, http://www.goarch.org/chapel/saints/103.