Theodore the Presbyter

Theodore, presbyter of the church at Antioch, a careful investigator and skilled in speech, wrote fifteen books On the Incarnation of the Lord against the Apollinarians and the Anomoeans, containing some fifteen thousand lines. In them he showed by the clearest reasoning and by the testimony of Scripture that just as the Lord Jesus had the fullness of deity, so he had the fullness of humanity. He also taught that man consists of only two substances, soul and body, and that sense and spirit are not different substances but inherent, inborn faculties of the soul, through which it is inspired and has reason, and through which it makes the body capable of feeling. Moreover, the fourteenth book of this work deals entirely with the uncreated, alone incorporeal and ruling nature of the holy Trinity, and with the rationality of animals, which he explains in a devout spirit on the authority of the Holy Scriptures. In the fifteenth volume he confirms and strengthens the whole body of his work by citing the traditions of the fathers. [a]