WHAT shall I say of those two brethren who lived beyond that desert of the Thebaiid where once the blessed Antony dwelt, and, not being sufficiently influenced by careful discrimination, when they were going through the vast and extended waste determined not to take any food with them, except such as the Lord Himself might provide for them. And when as they wandered through the deserts and were already fainting from hunger they were spied at a distance by the Mazices (a race which is even more savage and ferocious than almost all wild tribes, for they are not driven to shed blood, as other tribes are, from desire of spoil but from simple ferocity of mind), and when these acting contrary to their natural ferocity, met them with bread, one of the two as discretion came to his aid, received it with delight and thankfulness as if it were offered to him by the Lord, thinking that the food had been divinely provided for him, and that it was God’s doing that those who always delighted in bloodshed had offered the staff of life to men who were already fainting and dying; but the other refused the food because it was offered to him by men and died of starvation. And though this sprang in the first instance from a persuasion that was blame-worthy yet one of them by the help of discretion got the better of the idea which he had rashly and carelessly conceived, but the other persisting in his obstinate folly, and being utterly lacking in discretion, brought upon himself that death which the Lord would have averted, as he would not believe that it was owing to a Divine impulse that the fierce barbarians forgot their natural ferocity and offered them bread instead of a sword.
WHY also should I speak of one (whose name we had rather not mention as he is still alive), who for a long while received a devil in the brightness of an angelic form, and was often deceived by countless revelations from him and believed that he was a messenger of righteousness: for when these were granted, every night he provided a light in his cell without the need of any lamp. At last he was ordered by the devil to offer up to God his own son who was living with him…in order that his merits might by this sacrifice be made equal to those of the patriarch Abraham. And he was so far seduced by his persuasion that he would really have committed the murder unless his son had seen him getting ready the knife and sharpening it with unusual care, and looking for the chains with which he meant to tie him up for the sacrifice when he was going to offer him up; and had fled away in terror with a presentiment of the coming crime.
Fathers, Nicene & Post-Nicene, s.2, v.11 (35), p.631, The Works of John Cassian