Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 12:35-40

“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.”