Ephesians 5:8 - Matthew Poole's English Annotations on the Holy Bible

For ye were sometimes darkness; the same as in darkness, Romans 2:19 1 Thessalonians 5:4; viz. the darkness of sin, ignorance, unbelief. The abstract being put for the concrete, shows the greatness of that darkness in which they were. But now are ye light in the Lord; either now, being in Christ, ye are light, or rather, ye are enlightened or made light by Christ, being furnished with spiritual knowledge, faith, purity, and holiness. Walk as children of light; a Hebraism; children of light, for those that are in the light, 1 Thessalonians 5:5: q.d. Let your conversation be suitable to your condition and privileges: see 1 John 1:7.