Gregory the Great — as excerpted in the Catena Aurea on Luke 12:35-40

“(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.”