The Miracle of the Oil
As steward of Vatopedi, Gennadius oversaw the community's stores at a time when the monastery's supply of oil had dwindled. Exercising careful economy, he restricted the remaining oil to the needs of the church alone. When the monastery's cook complained to the abbot (igumen) that there was no oil left for preparing food, the abbot directed Gennadius to place his trust in the Mother of God and to supply oil for all the monastery's needs, distributing it to the whole brotherhood as before.
According to the account, when Gennadius went to the storeroom he found the oil tank overflowing, the oil spilling across the floor and reaching as far as the door. The event was understood as a vindication of the abbot's trust in the providence of the Theotokos, and it was ascribed to her intercession.