 His pupil, Nestorius, became the subject of the Nestorian controversy; the Nestorians translated his books into Syriac and regarded Theodore as their great "Doctor".This made Catholics suspicious of his writings, which were finally condemned after the famous controversy on The Three Chapters.Theodore's commentary on St. John's Gospel, in Syriac, was published, with a Latin translation, by a Catholic scholar, Dr. Chabot.