Would indeed that some profit might come to myself from this effort! I should have undertaken this labour with the greater readiness, if I could have hope of sharing, according to the Scripture, in the fruits of the plough and the threshing-floor; the toil would then have been a pleasure. As it is, this my knowledge of the beauty of virginity is in some sort vain and useless to me, just as the grain is to the muzzled ox that treads the floor, or the water that streams from the precipice to a thirsty man when he cannot reach it.
Happy they who have still the power of choosing the better way, and have not debarred themselves from it by engagements of the secular life, as we have, whom a gulf now divides from glorious virginity: no one can climb up to that who has once planted his foot upon the secular life. We are but spectators of others' blessings and witnesses to the happiness of another class. Even if we strike out some fitting thoughts about virginity, we shall not be better than the cooks and scullions who provide sweet luxuries for the tables of the rich, without having any portion themselves in what they prepare.
What a blessing if it had been otherwise, if we had not to learn the good by after-regrets! Now they are the enviable ones, they succeed even beyond their prayers and their desires, who have not put out of their power the enjoyment of these delights. We are like those who have a wealthy society with which to compare their own poverty, and so are all the more vexed and discontented with their present lot. The more exactly we understand the riches of virginity, the more we must bewail the other life; for we realize by this contrast with better things, how poor it is.
I do not speak only of the future rewards in store for those who have lived thus excellently, but those rewards also which they have while alive here; for if any one would make up his mind to measure exactly the difference between the two courses, he would find it nearly as great as that between heaven and earth. The truth of this statement may be known by looking at actual facts.
Source: On Virginity (New Advent)