49 Wherefore also the virgins of God without blame indeed, “follow the Lamb wherever He shall have gone,” both the cleansing of sins being perfected, and virginity being kept, which, were it lost, could not return: but, because that same Apocalypse itself, wherein such unto one such were revealed, in this also praises them, that “in their mouth there was not found a lie:” let them remember in this also to be true, that they dare not say that they have not sin. Forsooth the same John, who saw that, has said this, “If we shall have said that we have not sin, we deceive our own selves, and the truth is not in us; but if we shall have confessed our faults, He is faithful and just, so as to forgive us our sins, and to cleanse us from all unrighteousness.
But if we shall have said that we have not sinned, we shall make Him a liar, and His word shall not be in us.” This surely is not said unto these or those, but unto all Christians, wherein virgins also ought to recognize themselves. For thus they shall be without a lie, such as in the Apocalypse they appeared. And by this means so long as there is not as yet perfection in heavenly height, confession in lowliness makes them without blame.
Source: On Holy Virginity (New Advent)