CHAPTER IV: How vainglory attacks a monk on the right had and on the left. For where the devil cannot create vainglory in a man by means of his well-fitting and neat dress, he tries to introduce it by means of a dirty, cheap, and uncared-for style. If he cannot drag a man down by honour, he overthrows him by humility. If he cannot make him puffed up by the grace of knowledge and eloquence, he pulls him down by the weight of silence. If a man fasts openly, he is attacked by the pride of vanity.

John Cassian, Institutes