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.
(ubi sup.) For He comes when He hastens to judgment, but He knocks, when already by the pain of sickness He denotes that death is at hand; to whom we immediately open if we receive Him with love. For he who trembles to depart from the body, has no wish to open to the Judge knocking, and dreads to see that Judge whom he remembers to have despised. But he who rests secure concerning his hope and works, immediately opens to Him that knocks; for when he is aware of the time of death drawing near, he grows joyful, because of the glory of his reward; and hence it is added, Blessed are the servants whom the Lord when he cometh shall find watching. He watches who keeps the eyes of his mind open to behold thetrue light; who by his works maintains that which he beholds, who drives from himself the darkness of sloth and carelessness.