6 Let us see then, my good friend, how you acted in these surroundings. You promised to marry your unhappy victim; and then in that venerable cave you took from her, either as securities for her fidelity or as a pledge of the engagement, some locks of hair, some handkerchiefs, and a girdle, swearing at the same time that you would never love another as you loved her. Then you ran to the place where the shepherds were watching their flocks when they heard the angels singing over head, and there again you plighted your troth.
I say no more; I do not accuse you of kissing her or of embracing her. Although I believe that there is nothing of which you are not capable, still the sacred character of stable and field forbids me to suppose you guilty except in will and determination. Unhappy man! When you first stood beside the virgin in the cave, surely a mist must have dimmed your eyes, your tongue must have been paralysed, your arms must have fallen to your sides, your chest must have heaved, your gait must have become unsteady.
She had assumed the bridal-veil of Christ in the basilica of the apostle Peter and had vowed to live henceforth in the monastery, in the spots consecrated by the Lord's Cross, His Resurrection, and His Ascension; and yet after all this you dared to accept that hair, which at Christ's command she had cut off in the cave of His birth, as a token of her readiness to sleep with you. Again you used to sit beneath her window from the evening till the morning; and because owing to its height you could not come to close quarters with her, you conveyed things to her and she in her turn to you by the aid of a cord.
How careful the lady superior must have been is shown by the fact that you never saw the virgin except in church; and that, although both of you had the same inclination, you could find no means of conversing with each other except at a window under cover of night. As I was afterwards told you used to be quite sorry when the sun rose. Your face looked bloodless, shrunken, and pale; and to remove all suspicion, you used to be for ever reading Christ's gospel as if you were a deacon indeed. I and others used to attribute your paleness to fasting, and to admire your bloodless lips— so unlike the brilliant colour which they generally showed— in the belief that they were caused by frequent vigils.
You were already preparing ladders to fetch the unhappy virgin from her cell; you had already arranged your route, ordered vessels, settled a day, and thought out the details of your flight, when, behold, the angel who kept the door of Mary's chamber, who watched over the cradle of the Lord and who bore in his arms the infant Christ, in whose presence you had committed these great sins, himself and none other, betrayed you.
Source: Letters (New Advent)