6 But if even real virgins, when they have other failings, are not saved by their physical virginity, what shall become of those who have prostituted the members of Christ, and have changed the temple of the Holy Ghost into a brothel? Straightway shall they hear the words: “Come down and sit in the dust, O virgin daughter of Babylon, sit on the ground; there is no throne, O daughter of the Chaldæans: for you shall no more be called tender and delicate. Take the millstone and grind meal; uncover your locks, make bare the legs, pass over the rivers; your nakedness shall be uncovered, yea, your shame shall be seen.” And shall she come to this after the bridal-chamber of God the Son, after the kisses of Him who is to her both kinsman and spouse? Yes, she of whom the prophetic utterance once sang, “Upon your right hand stood the queen in a vesture of gold wrought about with various colours,” shall be made naked, and her skirts shall be discovered upon her face. She shall sit by the waters of loneliness, her pitcher laid aside; and shall open her feet to every one that passes by, and shall be polluted to the crown of her head. Better had it been for her to have submitted to the yoke of marriage, to have walked in level places, than thus, aspiring to loftier heights, to fall into the deep of hell. I pray you, let not Zion the faithful city become a harlot: let it not be that where the Trinity has been entertained, there demons shall dance and owls make their nests, and jackals build. Let us not loose the belt that binds the breast. When lust tickles the sense and the soft fire of sensual pleasure sheds over us its pleasing glow, let us immediately break forth and cry: “The Lord is on my side: I will not fear what the flesh can do unto me.” When the inner man shows signs for a time of wavering between vice and virtue, say: “Why art you cast down, O my soul, and why are you disquieted within me? Hope thou in God, for I shall yet praise Him who is the health of my countenance and my God.” You must never let suggestions of evil grow on you, or a babel of disorder win strength in your breast. Slay the enemy while he is small; and, that you may not have a crop of tares, nip the evil in the bud. Bear in mind the warning words of the Psalmist: “Hapless daughter of Babylon, happy shall he be that rewards you as you have served us. Happy shall he be that takes and dashes your little ones against the stones.” Because natural heat inevitably kindles in a man sensual passion, he is praised and accounted happy who, when foul suggestions arise in his mind, gives them no quarter, but dashes them instantly against the rock. “Now the Rock is Christ.”
Source: Letters (New Advent)