New Defender's Study Bible Notes
5:11 reprove. The Christian should not only refuse to compromise with the “unfruitful works of darkness,” but openly reprove and rebuke them.
5:14 he saith. This quotation is evidently a rather free translation and interpretation of Isaiah 60:1-3, as used and applied by the Holy Spirit.
5:16 Redeeming the time. Note also Colossians 4:5. Time is our most valuable possession and should not be squandered. Lost health can often be regained, and so can money and earthly possessions, but time wasted is gone forever. See notes on Psalm 90:10-12.