1 Thessalonians 5:5-7
5. The oldest manuscripts read, "FOR ye are all," &c. Ye have no reason for fear, or for being taken by surprise, by the coming of the day of the Lord: "For ye are all sons (so the Greek) of light and sons of day"; a Hebrew idiom, implying that as sons resemble their fathers, so you are in character light (intellectually and morally illuminated in a spiritual point of view), Lu 16:8; Joh 12:36.
are not of—that is, belong not to night nor darkness. The change of person from "ye" to "we" implies this: Ye are sons of light because ye are Christians; and we, Christians, are not of night nor darkness.6. others—Greek, "the rest" of the world: the unconverted (1Th 4:13). "Sleep" here is worldly apathy to spiritual things (Ro 13:11; Eph 5:14); in 1Th 5:7, ordinary sleep; in 1Th 5:10, death.
watch—for Christ's coming; literally, "be wakeful." The same Greek occurs in 1Co 15:34; 2Ti 2:26. be sober—refraining from carnal indulgence, mental or sensual (1Pe 5:8).7. This verse is to be taken in the literal sense. Night is the time when sleepers sleep, and drinking men are drunk. To sleep by day would imply great indolence; to be drunken by day, great shamelessness. Now, in a spiritual sense, "we Christians profess to be day people, not night people; therefore our work ought to be day work, not night work; our conduct such as will bear the eye of day, and such has no need of the veil of night" [EDMUNDS], (1Th 5:8).