A certain brother came to Abbot Silvanus at Mount Sinai, and seeing the hermits at work, he exclaimed, “Why do you work for the bread that perishes? We read that Mary chose the better part – namely, to sit at the feet of her Lord.” Then the abbot said to his disciple Zachary, “Give the brother a book, and put him in an empty cell, and let him read.” At the ninth hour the brother who was reading began to wonder why the abbot had not called him to eat. Sometime later he went directly to the abbot and said, “Did the brethren not eat today, father?” “Oh yes,” said the abbot. “They have just finished their meal.” “Well,” said the brother, “Why did you not call me?” “Because you are a spiritual man,” answered the abbot. “You do not need the food that perishes. The rest of us have to work. But you have chosen the better part; you have read all day and can surely get along without food.”

Source: Wisdom of the Desert