Ephesians 5:13

that are reproved--rather, "when they are reproved," namely, by you (Eph 5:11). whatsoever doth make manifest--rather, "everything that is (that is, suffers itself to be) made manifest (or 'shone upon,' namely, by your 'reproving,' Eph 5:11) is (thenceforth no longer 'darkness,' Eph 5:8, but) light." The devil and the wicked will not suffer themselves to be made manifest by the light, but love darkness, though outwardly the light shines round them. Therefore, "light" has no transforming effect on them, so that they do not become light (Joh 3:19-20). But, says the apostle, you being now light yourselves (Eph 5:8), by bringing to light through reproof those who are in darkness, will convert them to light. Your consistent lives and faithful reproofs will be your "armor of light" (Rom 13:12) in making an inroad on the kingdom of darkness.

We had several important exhortations in the close of the foregoing chapter, and they are continued in this: particularly, I. We have here an exhortation to mutual love and charity (Eph 5:1, Eph 5:2). II. Against all manner of uncleanness, with proper arguments and remedies proposed against such sins: and some further cautions are added, and other duties recommended (v. 3-20). III. The apostle directs to the conscientious discharge of relative duties, from Eph 5:21, throughout this, and in the beginning of the next chapter.

5:13-14 “Awake, O sleeper”: This might be a fragment from an unknown Christian song, perhaps based on texts in Isaiah (cp. Isa 26:19; 52:1; 60:1). It calls on God’s people to turn from their sinful darkness and live in the full light of Christ.