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St. Isaac is fully accepted as a saint in the Orthodox Church, though during his lifetime, he was [[canons (law)|canonically]] a member of the
Assyrian Church of the East (i.e., the [[Nestorianism|Nestorians ]]). His writings nevertheless came to be extremely popular in Orthodox monastic circles and are well-known for their Orthodoxy. [[Veneration]] for him grew, and he came to be incorporated into the Orthodox calendar of saints. His inclusion is thus an indication that the Church does not regard [[canonical territory|canonical boundaries]] as being the litmus test of Orthodoxy.