John Cassian, The Institutes VII.12: An instance of a lukewarm monk caught in the snares of covetousness

I know of one, who thinks himself a monk, and what is worse flatters himself on his perfection, who had been received into a monastery, and when charged by his Abbot not to turn his thoughts back to those things which he had given up and renounced, but to free himself from covetousness, the root of all kinds of evil, and from earthly snares; and when told that if he wished to be cleansed from his former passions, by which he saw that he was from time to time grievously oppressed, he should cease from caring about those things which even formerly were not his own, entangled in the chains of which he certainly could not make progress towards purifying himself of his faults: with an angry expression he did not hesitate to answer, “If you have that with which you can support others, why do you forbid me to have it as well?”