29 But, lo, That Lamb goes by a Virgin road, how shall they go after Him, who have lost what there is no way for them to recover? Do ye, therefore, do ye go after Him, His virgins; do ye there also go after Him, in that on this one account wherever He shall have gone, you follow Him: for unto any other gift whatsoever of holiness, whereby to follow Him, we can exhort married persons, save this which they have lost beyond power of recovery. Do ye, therefore, follow Him, by holding with perseverance what you have vowed with ardor.
Go when you can, that the good of virginity perish not from you, unto which you can do nothing, in order that it may return. The rest of the multitude of the faithful will see you, which cannot unto this follow the Lamb; it will see you, it will not envy you: and by rejoicing together with you, what it has not in itself, it will have in you. For that new song also, which is your own, it will not be able to utter; but it will not be unable to hear, and to be delighted with your so excellent good: but you, who shall both utter and hear, in that what you shall say, this you shall hear of yourselves, will exult with greater happiness, and reign with greater joy.
But they will have no sorrow on account of your greater joy, to whom this shall be wanting. Forsooth That Lamb, Whom you shall follow wherever He shall have gone, will not desert those who cannot follow Him, where you can. Almighty is the Lamb, of Whom we speak. He both will go before you, and will not depart from them, when God shall be all in all. And they, who shall have less, shall not turn away in dislike from you: for, where there is no envying, difference exists with concord. Take to you, then, have trust, be strong, continue, you who vow and pay unto the Lord your God vows of perpetual continence, not for the sake of this present world, but for the sake of the kingdom of Heaven.
Source: On Holy Virginity (New Advent)