Ascetic Life
The sources describe an unusually severe discipline: Sergius fasted constantly and permitted himself to sleep only while sitting upright. By tradition this labor was rewarded with the gifts of unceasing prayer, clairvoyance, and the working of miracles, qualities the synaxarion attributes to him without detailing specific episodes.
His monastic standing was that of a schema-monk, the highest degree of the Eastern monastic life, and he is counted among the ascetics of the Russian north associated with the Shukhtom hermitage.