4. 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.