Theophylact of Bulgaria
Our Lord having taught His disciples moderation, taking from them all care and conceit of this life, now leads them on to serve and obey, saying, Let your loins be girded, that is, always ready to do the work of your Lord, and your lamps burning, that is, do not lead a life in darkness, but have with you the light of reason, shewing you what to do and what to avoid. For this world is the night, but they have their loins girded, who follow a practical or active life. For such is the condition of servants who must have with them also lamps burning; that is, the gift of discernment, that the active man may be able to distinguish not only what he ought to do, but in what way; otherwise men rush down the precipice of pride.
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But we must observe, that He first orders our loins to be girded, secondly, our lamps to be burning. For first indeed comes action, then reflection, which is an enlightening of the mind. Let us then strive to exercise the virtues, that we may have two lamps burning, that is, the conception of the mind ever shining forth in the soul, by which we are ourselves enlightened, and learning, whereby we enlighten others.
Daily also in the heavens He betroths the souls of the Saints, whom Paul or another offers to Him, as a chaste virgin. (2 Cor 11:2.) But He returns from the celebration of the heavenly marriage, perhaps to all at the end of the whole world, when He shall come from heaven in the glory of the Father; perhaps also every hour standing suddenly present at the death of each individual.
Or, He will gird Himself, in that He imparts not the whole fulness of blessings, but confines it within a certain measure. For who can comprehend God how great He is? Therefore are the Seraphims said to veil their countenance, because of the excellence of the Divine brightness. It follows, and will make them to sit down; for as a man sitting down causes his whole body to rest, so in the future coming the Saints will have complete rest; for here they have not rest for the body, but there together with their souls their spiritual bodies partaking of immortality will rejoice in perfect rest.
That is, Give back to them, as it were, an equal return, that as they served Him, so also He will serve them.
Or since the watches are the hours of the night which lull men to sleep, you must understand that there are also in our life certain hours which make us happy if we are found awake. Does any one seize your goods? Are your children dead? Are you accused? But if at these times you have done nothing against the commandments of God, He will find you watching in the second and third watch, that is, at the evil time, which brings destructive sleep to idle souls.
Some understand this thief to be the devil, the house, the soul, the goodman of the house, man. This interpretation, however, does not seem to agree with what follows. For the Lord’s coming is compared to the thief as suddenly at hand, according to the word of the Apostle, The day of the Lord so cometh as a thief in the night. (1 Thess. 5:2.) And hence also it is here added, Be ye also ready, for the Son of man cometh at an hour when ye think not.