Gregory the Great
Catena Aurea · Lukasevangelium 12
Let your loins be girded about, and your lights burning; And ye yourselves like unto men that wait for their lord, when he will return from the wedding; that when he cometh and knocketh, they may open unto him immediately. Blessed are those servants, whom the lord when he cometh shall find watching: verily I say unto you, that he shall gird himself, and make them to sit down to meat, and will come forth and serve them. And if he shall come in the second watch, or in the third watch, and find them so, blessed are those servants. And this know, that if the goodman of the house had known what hour the thief would come, he would have watched, and not have suffered his house to be broken through. Be ye therefore ready also: for the Son of man cometh at an hour when ye think not.
(Hom. 13. in Evang.) Or else, we gird our loins when by continence we control the lusts of the flesh. For the lust of men is in their loins, and of women in their womb; by the name of loins, therefore, from the principal sex, lust is signified. But because it is a small thing not to do evil, unless also men strive to labour in good works, it is added, And your lamps burning in your hands; for we hold burning lamps in our hands, when by good works we shew forth bright examples to our neighbours.