But those who are despised for their ignorance, and set down as fools and abject slaves, no sooner commit themselves to God's guidance by accepting the teaching of Jesus, than, so far from defiling themselves by licentious indulgence or the gratification of shameless passion, they in many cases, like perfect priests, for whom such pleasures have no charm, keep themselves in act and in thought in a state of virgin purity. The Athenians have one hierophant, who, not having confidence in his power to restrain his passions within the limits he prescribed for himself, determined to check them at their seat by the application of hemlock; and thus he was accounted pure, and fit for the celebration of religious worship among the Athenians.
But among Christians may be found men who have no need of hemlock to fit them for the pure service of God, and for whom the Word in place of hemlock is able to drive all evil desires from their thoughts, so that they may present their prayers to the Divine Being. And attached to the other so-called gods are a select number of virgins, who are guarded by men, or it may be not guarded (for that is not the point in question at present), and who are supposed to live in purity for the honour of the god they serve.
But among Christians, those who maintain a perpetual virginity do so for no human honours, for no fee or reward, from no motive of vainglory; but “as they choose to retain God in their knowledge,” they are preserved by God in a spirit well-pleasing to Him, and in the discharge of every duty, being filled with all righteousness and goodness.
Source: Against Celsus (New Advent)