Pope Shenouda III
Whenever you feel hungry and covet food, rebuke yourself:
Say to yourself: When you give up this sin, I shall allow you to eat, for the Bible says: “If anyone will not work, neither shall he eat.” (2 Thess 3:10), and you have not repented in a way befitting the fast or befitting a heart that is the residence of God.
Rebuke yourself, and say to it: What is the use of me shunning food if I have not yet given up the sin that separates me from God and that makes all my fast of no avail?