Second Council of Constantinople, Capitulum XII

If anyone defends the impious Theodore of Mopsuestia, who has said that the Word of God is one person, but that another person is Christ, vexed by the sufferings of the soul and the desires of the flesh, and separated little by little above that which is inferior, and become better by the progress in good works and irreproachable in his manner of life, as a mere man was baptized in the name of the Father, and of the Son, and of the Holy Ghost, and obtained by this baptism the grace of the Holy Spirit, and became worthy of Sonship, and to be worshipped out of regard to the Person of God the Word (just as one worships the image of an emperor) and that he is become, after the resurrection, unchangeable in his thoughts and altogether without sin.  And, again, this same impious Theodore has also said that the union of God the Word with Christ is like to that which, according to the doctrine of the Apostle, exists between a man and his wife, “They twain shall be in one flesh.”  The same [Theodore] has dared, among numerous other blasphemies, to say that when after the resurrection the Lord breathed upon his disciples, saying, “Receive the Holy Ghost,” he did not really give them the Holy Spirit, but that he breathed upon them only as a sign.  He likewise has said that the profession of faith made by Thomas when he had, after the resurrection, touched the hands and the side of the Lord, viz.:  “My Lord and my God,” was not said in reference to Christ, but that Thomas, filled with wonder at the miracle of the resurrection, thus thanked God who had raised up Christ.  And moreover (which is still more scandalous) this same Theodore in his Commentary on the Acts of the Apostles compares Christ to Plato, Manichæus, Epicurus and Marcion, and says that as each of these men having discovered his own doctrine, had given his name to his disciples, who were called Platonists, Manicheans, Epicureans and Marcionites, just so Christ, having discovered his doctrine, had given the name Christians to his disciples.  If, then, anyone shall defend this most impious Theodore and his impious writings, in which he vomits the blasphemies mentioned above, and countless others besides against our Great God and Saviour Jesus Christ, and if anyone does not anathematize him or his impious writings, as well as all those who protect or defend him, or who assert that his exegesis is orthodox, or who write in favour of him and of his impious works, or those who share the same opinions, or those who have shared them and still continue unto the end in this heresy:  let him be anathema.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.