21 Here some one will say, What has this to do with holy virginity, or perpetual continence, the setting forth of which was undertaken in this discourse? To whom I make answer in the first place, what I mentioned above, that the glory of that greater good is greater from the fact that, in order to obtain it, the good of married life is surmounted, not the sin of marriage shunned. Otherwise it would be enough for perpetual continence, not to be specially praised, but only not to be blamed: if it were maintained on this account, because it was a crime to wed.
In the next place, because it is not by human judgment, but by authority of Divine Scripture, that men must be exhorted unto so excellent a gift, we must plead not in a common-place manner, or merely by the way, that divine Scripture itself seem not to any one in any matter to have lied. For they discourage rather than exhort holy virgins, who compel them to continue so by passing sentence on marriage. For whence can they feel sure that that is true, which is written, “And he, who gives her not in marriage, does better:” if they think that false, which yet is written close above, “Both he, who gives his virgin, does well?”
But, if they shall without all doubt have believed Scripture speaking of the good of marriage, confirmed by the same most true authority of the divine oracle, they will hasten beyond unto their own better part with glowing and confident eagerness. Wherefore we have already spoken enough for the business which we have taken in hand, and, so far as we could, have shown, that neither that saying of the Apostle, “But I think that this is good by reason of the present necessity,” is so to be understood, as though in this life holy virgins are better than faithful women married, but are equal in the kingdom of heaven, and in a future life: nor that other, where he says of such as wed, “But such shall have tribulation of the flesh, but I spare you;” is to be so understood, as though he chose rather to be silent on, than to speak of, the sin and condemnation of marriage.
Forsooth two errors, contrary the one to the other, have, through not understanding them, taken hold of each one of these two sentences. For that concerning the present necessity they interpret in their own favor, who contend to equal such as wed to such as wed not: but this, where it is said, “But I spare you,” they who presume to condemn such as wed. But we, according to the faith and sound doctrine of holy Scriptures, both say that marriage is no sin, and yet set its good not only below virginal, but also below widowed continence; and say that the present necessity of married persons is an hindrance to their desert, not indeed unto life eternal, but unto an excellent glory and honor, which is reserved for perpetual continence: and that at this time marriage is not expedient save for such as contain not; and that on the tribulation of the flesh, which comes from the affection of the flesh, without which marriages of incontinent persons cannot be, the Apostle neither wished to be silent, as forewarning what was true, nor to unfold more fully, as sparing man's weakness.
Source: On Holy Virginity (New Advent)