Third Council of Constantinople, The Sentence Against the Monothelites. Session XIII. Nicene and Post-Nicene Fathers, series 2, vol. 14 (Percival, 1900), public domain.
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- The Sentence Against the Monothelites. Session XIII — The holy council said: After we had reconsidered, according to our promise which we had made to your highness, the doctrinal letters of Sergius, at one time patriarch of this royal god-protected city to Cyrus, who…vatican.va