24 Never incline your ear to words of mischief. For men often say an improper word to make trial of a virgin's steadfastness, to see if she hears it with pleasure, and if she is ready to unbend at every silly jest. Such persons applaud whatever you affirm and deny whatever you deny; they speak of you as not only holy but accomplished, and say that in you there is no guile. “Behold,” say they, “a true hand-maid of Christ; behold entire singleness of heart. How different from that rough, unsightly, countrified fright, who most likely never married because she could never find a husband.” Our natural weakness induces us readily to listen to such flatterers; but, though we may blush and reply that such praise is more than our due, the soul within us rejoices to hear itself praised.
Like the ark of the covenant Christ's spouse should be overlaid with gold within and without; she should be the guardian of the law of the Lord. Just as the ark contained nothing but the tables of the covenant, so in you there should be no thought of anything that is outside. For it pleases the Lord to sit in your mind as He once sat on the mercy-seat and the cherubims. As He sent His disciples to loose Him the foal of an ass that he might ride on it, so He sends them to release you from the cares of the world, that leaving the bricks and straw of Egypt, you may follow Him, the true Moses, through the wilderness and may enter the land of promise. Let no one dare to forbid you, neither mother nor sister nor kinswoman nor brother: “The Lord has need of you.” Should they seek to hinder you, let them fear the scourges that fell on Pharaoh, who, because he would not let God's people go that they might serve Him, suffered the plagues described in Scripture. Jesus entering into the temple cast out those things which belonged not to the temple. For God is jealous and will not allow the father's house to be made a den of robbers. Where money is counted, where doves are sold, where simplicity is stifled where, that is, a virgin's breast glows with cares of this world; straightway the veil of the temple is rent, the bridegroom rises in anger, he says: “Your house is left unto you desolate.” Read the gospel and see how Mary sitting at the feet of the Lord is set before the zealous Martha. In her anxiety to be hospitable Martha was preparing a meal for the Lord and His disciples; yet Jesus said to her: “Martha, Martha, you are careful and troubled about many things. But few things are needful or one. And Mary has chosen that good part which shall not be taken away from her.” Be then like Mary; prefer the food of the soul to that of the body. Leave it to your sisters to run to and fro and to seek how they may fitly welcome Christ. But do you, having once for all cast away the burden of the world, sit at the Lord's feet and say: “I have found him whom my soul loves; I will hold him, I will not let him go.” And He will answer: “My dove, my undefiled is but one; she is the only one of her mother, she is the choice one of her that bare her.” Now the mother of whom this is said is the heavenly Jerusalem.
Source: Letters (New Advent)