But know this. — The verses from Matthew 24:42 to Matthew 24:51 have nothing corresponding to them in the reports of the discourse given by St. Mark and St. Luke, but are found almost verbatim in another discourse reported by St. Luke 12:42, et seq. Here, as elsewhere, we have to choose between the assumption of a repetition of the same words, or of a transfer of what was spoken on one occasion to another; and of the two, the former hypothesis seems the more probable. It may be noted, however, that the variations in the three reports of this discourse indicate a comparatively free treatment of it, the natural result, probably, of its having been often reproduced, wholly or in part, orally before it was committed to writing. On ordinary grounds of evidence, St. Mark’s report, assuming his connection with St. Peter, would seem likely to come nearest to the very words spoken by our Lord.
The goodman of the house. — Better, as in Matthew 20:1., householder.
In what watch. — The night-watches were four in number, of three hours each. So in Luke 12:38, we have “the second or the third watch” specified. The allusion to the “thief coming” would seem to have passed into the proverbial saying, that the day of the Lord would come “as a thief in the night,” quoted by St. Paul in 1 Thessalonians 5:2.