Pay careful attention, then, to how you walk, not as unwise but as wise,
15. See then. If believers must not neglect to drive away the darkness of others by their own brightness, how much less ought they to be blind as to their own conduct in life? What darkness shall conceal those on whom Christ, the Sun of righteousness, has arisen? Placed, as it were, in a crowded theater, they ought to live under the eye of God and of angels.
These verses contain a caution against all manner of uncleanness, with proper remedies and arguments proposed: some further cautions are added, and other duties recommended. Filthy lusts must be suppressed, in order to the supporting of holy love. Walk in love, and shun fornication and all uncleanness. Fornication is folly committed between unmarried persons. All uncleanness includes all other sorts of filthy lusts, which were too common among the Gentiles.
Commenting on Ephesians 5:3-20
Wherefore be ye not unwise,.... No one would be thought to be unwise, but such are, who do not redeem time, and are ignorant of the will of the Lord; believers should not act the unwise part, neither in their talk, nor in their walk and conversation, nor in their use of time: but understanding what the will of the Lord is; or "of God"...