27 Therefore go on, Saints of God, boys and girls, males and females, unmarried men, and women; go on and persevere unto the end. Praise more sweetly the Lord, Whom ye think on more richly: hope more happily in Him, Whom ye serve more instantly: love more ardently Him, whom you please more attentively. With loins girded, and lamps burning, wait for the Lord, when He comes from the marriage. You shall bring unto the marriage of the Lamb a new song, which you shall sing on your harps.
Not surely such as the whole earth sings, unto which it is said, “Sing unto the Lord a new song; sing unto the Lord, the whole earth”: but such as no one shall be able to utter but you. For thus there saw you in the Apocalypse a certain one beloved above others by the Lamb, who had been wont to lie on His breast, and who used to drink in, and burst forth, the Word of God above wonders of heaven. He saw you twelve times twelve thousand of holy harpers, of undefiled virginity in body, of inviolate truth in heart; and he wrote of you, that you follow the Lamb wherever He shall go.
Where think we that This Lamb goes, where no one either dares or is able to follow save you? Where think we that He goes? Into what glades and meadows? Where, I think, the grass are joys; not vain joys of this world, lying madnesses; nor joys such as shall be in the kingdom of God itself, for the rest that are not virgins; but distinct from the portion of joys of all the rest. Joy of the virgins of Christ, of Christ, in Christ, with Christ, after Christ, through Christ, for Christ.
The joys peculiar to the virgins of Christ, are not the same as of such as are not virgins, although of Christ. For there are to different persons different joys, but to none such. Go (enter) into these, follow the Lamb, because the Flesh of the Lamb also is assuredly virgin. For this He retained in Himself when grown up, which He took not away from His Mother by His conception and birth. Follow Him, as you deserve, in virginity of heart and flesh, wheresoever He shall have gone.
For what is it to follow, but to imitate? Because “Christ has suffered for us,” leaving us an example, as says the Apostle Peter, “that we should follow His steps.” Him each one follows in that, wherein he imitates Him: not so far forth as He is the only Son of God, by Whom all things were made; but so far forth as, the Son of Man, He set forth in Himself, what behooved for us to imitate. And many things in Him are set forth for all to imitate: but virginity of the flesh not for all; for they have not what to do in order to be virgins, in whom it has been already brought to pass that they be not virgins.
Source: On Holy Virginity (New Advent)