29 Many are the stratagems which the wily enemy employs against us. “The serpent,” we are told, “was more subtle than any beast of the field which the Lord God had made.” And the apostle says: “We are not ignorant of his devices.” Neither an affected shabbiness nor a stylish smartness becomes a Christian. If there is anything of which you are ignorant, if you have any doubt about Scripture, ask one whose life commends him, whose age puts him above suspicion, whose reputation does not belie him; one who may be able to say: “I have espoused you to one husband that I may present you as a chaste virgin to Christ.” Or if there should be none such able to explain, it is better to avoid danger at the price of ignorance than to court it for the sake of learning. Remember that you walk in the midst of snares, and that many veteran virgins, of a chastity never called in question, have, on the very threshold of death, let their crowns fall from their hands.
If any of your handmaids share your vocation, do not lift up yourself against them or pride yourself because you are their mistress. You have all chosen one Bridegroom; you all sing the same psalms; together you receive the Body of Christ. Why then should your thoughts be different? You must try to win others, and that you may attract the more readily you must treat the virgins in your train with the greatest respect. If you find one of them weak in the faith, be attentive to her, comfort her, caress her, and make her chastity your treasure. But if a girl pretends to have a vocation simply because she desires to escape from service, read aloud to her the words of the apostle: “It is better to marry than to burn.”
Idle persons and busybodies, whether virgins or widows; such as go from house to house calling on married women and displaying an unblushing effrontery greater than that of a stage parasite, cast from you as you would the plague. For “evil communications corrupt good manners,” and women like these care for nothing but their lowest appetites. They will often urge you, saying, “My dear creature, make the best of your advantages, and live while life is yours,” and “Surely you are not laying up money for your children.” Given to wine and wantonness, they instill all manner of mischief into people's minds, and induce even the most austere to indulge in enervating pleasures. And “when they have begun to wax wanton against Christ they will marry, having condemnation because they have rejected their first faith.”
Do not seek to appear over-eloquent, nor trifle with verse, nor make yourself gay with lyric songs. And do not, out of affectation, follow the sickly taste of married ladies who, now pressing their teeth together, now keeping their lips wide apart, speak with a lisp, and purposely clip their words, because they fancy that to pronounce them naturally is a mark of country breeding. Accordingly they find pleasure in what I may call an adultery of the tongue. For “what communion has light with darkness? And what concord has Christ with Belial?” How can Horace go with the psalter, Virgil with the gospels, Cicero with the apostle? Is not a brother made to stumble if he sees you sitting at meat in an idol's temple? Although “unto the pure all things are pure,” and “nothing is to be refused if it be received with thanksgiving,” still we ought not to drink the cup of Christ, and, at the same time, the cup of devils. Let me relate to you the story of my own miserable experience.
Source: Letters (New Advent)