Gregory the Great

(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.