Charles Ellicott Commentary Luke 17:24

"for as the lightning, when it lighteneth out of the one part under the heaven, shineth unto the other part under heaven; so shall the Son of man be in his day." — Luke 17:24 (ASV)

For as the lightning.—See Note on Matthew 24:27.

There is, however, a noticeable variation in the form; the two “parts under heaven” taking the place of the “east” and the “west,” and the “day of the Son of Man” taking the place of the more formal “coming,” or parousia, which, as far as the Gospels are concerned, occurs only in St. Matthew. There is also, perhaps, more pictorial vividness in the two words, “lighteneth,” “shineth,” than in St. Matthew’s “cometh out,” and “appeareth,” which is probably the right rendering of the word there translated “shineth.” In any case, the words in St. Matthew are less vivid in their force.