John Dummelow's Commentary on the Bible - Ephesians 5:1-33
The old Darkness and new Light. Rules for the Married1, 2. In close connexion with what precedes. ’It is the mark of beloved children to become imitators of a loving Father; practise the self-sacrifice of Christ, which shows how He loved us and the Father.’3-14. Special exhortation against covetousness and impurity.3. But] The five sins mentioned in Ephesians 4:25-32 are to be put away; these two are not even to be mentioned: ’saints’ are set apart from such subjects, being consecrated to God.... read more
Expository Notes of Dr. Thomas Constable - Ephesians 5:8
The reason Christians should not partake with unbelievers in their evil deeds is that we were formerly darkness (cf. Ephesians 4:17-19) but are now light, having trusted Jesus Christ (Ephesians 2:1-3; Ephesians 3:17-21; cf. Matthew 5:14; Colossians 1:12-13). The second command is to walk as children of light. Obviously it is possible for the children of light not to walk (live) as children of light (cf. 1 John 1:6-7). Otherwise the command would be unnecessary."The gravest disservice that any... read more