In commenting on Luke 12:35 from today’s Mass Readings, Cyril of Alexandria writes:
“The girding of our loins signifies the readiness of the mind to work hard in every thing praiseworthy. Those who apply themselves to bodily labors and are engaged in strenuous toil have their loins girded. The lamp apparently represents the wakefulness of the mind and intellectual cheerfulness. We say that the human mind is awake when it repels any tendency to slumber off into that carelessness that often is the means of bringing it into subjection to every kind of wickedness. When sunk in stupor, the heavenly light within the mind is liable to be endangered, or even already is in danger from a violent and impetuous blast of wind. Christ commands us to be awake. To this, his disciple also arouses us by saying, “Be awake. Be watchful.” Further on, the very wise Paul also says, “Awake, O sleeper, and arise from the dead: and Christ shall give you light.” (Commentary on Luke, Homily 92).”