What was John Cassian's greatest contribution to monasticism?

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John Cassian's greatest contribution to monasticism was his writings, particularly the Conferences, which shared the teachings and practices of the Desert Fathers with Western monastics. These writings shaped the monastic traditions of both the Western and Eastern Churches and became foundational texts for centuries. While Cassian did found a monastery in Marseille, it was not the first in the West and his other writings, although important, did not have the same lasting impact as the Conferences.

What Was John Cassian's Greatest Contribution to Monasticism