The Twelve Books on the Institutes of the Cœnobia, and the Remedies for the Eight Principal Faults

A monk therefore who wants to proceed to the struggle of interior conflicts should lay down this as a precaution for himself to begin with: viz.: that he will not in any case allow himself to be overcome by any delicacies, or take anything to eat or drink before the fast is over and the proper hour for refreshment has come, outside meal times; nor, when the meal is over, will he allow himself to take a morsel however small; and likewise that he will observe the canonical time and measure of sleep. For that self-indulgence must be cut off in the same way that the sin of unchastity has to be rooted out. For if a man is unable to check the unnecessary desires of the appetite how will he be able to extinguish the fire of carnal lust? And if a man is not able to control passions, which are openly manifest and are but small, how will he be able with temperate discretion to fight against those which are secret, and excite him, when none are there to see? And therefore strength of mind is tested in separate impulses and in any sort of passion: and if it is overcome in the case of very small and manifest desires, how it will endure in those that are really great and powerful and hidden, each man’s conscience must witness for himself.