Jamieson, Fausset & Brown

not in darkness--not in darkness of understanding (that is, spiritual ignorance) or of the moral nature (that is, a state of sin), Eph 4:18. that--Greek, "in order that"; with God results are all purposed. that day--Greek, "THE day"; the day of the Lord (Heb 10:25, "the day"), in contrast to "darkness." overtake--unexpectedly (compare Joh 12:35). as a thief--The two oldest manuscripts read, "as (the daylight overtakes) thieves" (Job 24:17). Old manuscripts and Vulgate read as English Version.