The remaining years of his life he devoted to theological speculation and ecclesiastical reforms. His religious enthusiasm led him to oppress his Jewish subjects; on the other hand he sought to reconcile the Christian sects, and to this effect propounded in his Ecthesis a conciliatory doctrine of monothelism.
In 649, after the accession of Martin I., he went to Rome, and did much to fan the zeal of the new pope, who in October of that year held the (first) Lateran synod, by which not only the Monothelite doctrine but also the moderating ecthesis of Heraclius and typus of Constans II.
So intense did the controversy now become, that at last, towards the end of 638, Heraclius published an Ecthesis, or Exposition of the Faith (composed by Sergius), which prohibited the use of the phrase "one energy," because of its disquieting effects on some minds, as seeming to militate against the doctrine of the two natures; while, on the other hand, the expression "two energies" was interdicted because it seemed to imply that Christ had two wills.
In this condemnation were included, not only the Ecthesis or exposition of faith of the patriarch Sergius for which the emperor Heraclius had stood sponsor, but also the Typus of Paul, the successor of Sergius, which had the support of the reigning emperor (Constans II.).
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