² not to become easily unsettled or alarmed by the teaching allegedly from us—whether by a prophecy or by word of mouth or by letter^(A)—asserting that the day of the Lord^(B) has already come.^(C)

⁴³ But understand this: If the owner of the house had known at what time of night the thief was coming,^(A) he would have kept watch and would not have let his house be broken into.

²⁴ For the Son of Man in his day^[a] will be like the lightning,^(A) which flashes and lights up the sky from one end to the other.