Shared ground
Jesus speaks to his disciples about a coming period of absence and longing: they will want “one of the days of the Son of Man” and will not get it (v.22). In that vulnerable gap, reports will circulate claiming special access—“Look here” or “Look there”—and Jesus rejects that whole chase (v.23).
When “his day” arrives, it will not be private, local, or discoverable through insider directions. Jesus compares it to lightning that fills the sky from one horizon to the other (v.24). The passage also ties that future revealing to Jesus’ near-term path: suffering and rejection come first (v.25). Finally, the Noah and Lot references underline a pattern: ordinary routines can continue right up to a sudden, decisive turning point that brings widespread destruction (vv.26–30; Luke 17:22–30).
Where interpretation differs (only where needed)
What “one of the days of the Son of Man” means (v.22). Some read it as the disciples longing for any return of Jesus’ visible presence and rule—any “day” that belongs to him. Others read it more as longing for clarity and vindication in a confusing time (even a single day that proves he is truly the Son of Man), rather than a full description of the final event.
What the Noah/Lot parallels are doing (vv.26–30). Many agree they highlight suddenness amid normal life. Some emphasize mainly the timing pattern (ordinary life continues until the moment arrives). Others think the parallels also imply a moral evaluation: normal life activities are listed because people are absorbed and unresponsive, not because eating or commerce are wrong.
What “revealed” emphasizes (v.30). Some take it to stress public visibility (it will be seen). Others take it to stress disclosure (his identity and authority will be unmistakably shown), which may include visibility but is not limited to it.
Why the disagreement exists
The text uses elastic phrases (“one of the days,” “revealed”) that can point either to an experience of presence, to vindication, or to public disclosure. Also, the Noah/Lot lists include morally neutral activities, which naturally raises the question: is the point simply sudden timing, or also a deeper critique of indifference?
What this passage clearly contributes
This section contributes a clear profile of the Son of Man’s “day”: it is not found by chasing reports, it is globally unmistakable (lightning imagery), and it is preceded by Jesus’ suffering and rejection (v.25). It also frames the event as arriving while ordinary life continues, with a sudden divide between “before” and “after,” illustrated through Noah and Lot (vv.26–30). These points are explicit in the passage; further conclusions about exact chronology beyond this comparison are inferences rather than stated claims.