St. Theodore on the Holy Canons

St. Theodore Studite ca. 759-826

We who are Orthodox flee every heresy and accept all generally recognized councils, whether Ecumenical or Local. And we likewise firmly stand by the sacred canons which they adopted. For no one can fully teach the word of truth, supposing himself to have the right Faith, if he does not accept the guidance of the divine canons.  (Letter 1:30)