John Cassian, The Institutes XI.16: Of him whom the superior came upon and found in his cell, deluded by idle vainglory

I remember an elder, when I was staying in the desert of Scete, who went to the cell of a certain brother to pay him a visit, and when he had reached the door heard him muttering inside, and stood still for a little while, wanting to know what it was that he was reading from the Bible or repeating by heart (as is customary) while he was at work. And when this most excellent eavesdropper diligently applied his ear and listened with some curiosity, he found that the man was induced by an attack of this spirit to fancy that he was delivering a stirring sermon to the people. And when the elder, as he stood still, heard him finish his discourse and return again to his office, and give out the dismissal of the catechumens, as the deacon does, then at last he knocked at the door, and the man came out, and met the elder with the customary reverence, and brought him in and (for his knowledge of what had been his thoughts made him uneasy) asked him when he had arrived, for fear lest he might have taken some harm from standing too long at the door: and the old man joking pleasantly replied, “I only got here while you were giving out the dismissal of the catechumens.”