John 12:36
36. These things spake Jesus, and departed, and did hide himself from them—He who spake as never man spake, and immediately after words fraught with unspeakable dignity and love, had to "hide Himself" from His auditors! What then must they have been? He retired, probably to Bethany. (The parallels are: Mt 21:17; Lu 21:37).
Ephesians 5:8
8. sometimes—"once." The emphasis is on "were." Ye ought to have no fellowship with sin, which is darkness, for your state as darkness is now PAST. Stronger than "in darkness" (Ro 2:19).
light—not merely "enlightened"; but light enlightening others (Eph 5:13). in—in union with the Lord, who is THE LIGHT. children of light—not merely "of the light"; just as "children of disobedience" is used on the opposite side; those whose distinguishing characteristic is light. PLINY, a heathen writing to Trajan, bears unwilling testimony to the extraordinary purity of Christians' lives, contrasted with the people around them. 1 Thessalonians 5:5
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.