5 You are better acquainted with all this than I am, and the few details that I have given I have learned from you. So intimate are you with Asella that you have seen, with your own eyes, her holy knees hardened like those of a camel from the frequency of her prayers. I merely set forth what I can glean from you. She is alike pleasant in her serious moods and serious in her pleasant ones: her manner, while winning, is always grave, and while grave is always winning. Her pale face indicates continence but does not betoken ostentation. Her speech is silent and her silence is speech. Her pace is neither too fast nor too slow. Her demeanor is always the same. She disregards refinement and is careless about her dress. When she does attend to it it is without attending. So entirely consistent has her life been that here in Rome, the centre of vain shows, wanton license, and idle pleasure, where to be humble is to be held spiritless, the good praise her conduct and the bad do not venture to impugn it. Let widows and virgins imitate her, let wedded wives make much of her, let sinful women fear her, and let bishops look up to her.
Source: Letters (New Advent)