Ephesians 4:17 (ASV)

Passage

This I say therefore, and testify in the Lord, that ye no longer walk as the Gentiles also walk, in the vanity of their mind,

Nearby Context

Ephesians 4:15 but speaking truth in love, we may grow up in all things into him, who is the head, [even] Christ;

Ephesians 4:16 from whom all the body fitly framed and knit together through that which every joint supplieth, according to the working in [due] measure of each several part, maketh the increase of the body unto the building up of itself in love.

Ephesians 4:17 This I say therefore, and testify in the Lord, that ye no longer walk as the Gentiles also walk, in the vanity of their mind,

Ephesians 4:18 being darkened in their understanding, alienated from the life of God, because of the ignorance that is in them, because of the hardening of their heart;

Ephesians 4:19 who being past feeling gave themselves up to lasciviousness, to work all uncleanness with greediness.

Study Lenses

The verse centers on "therefore", "testify", "lord", "longer", "walk", "gentiles", and "vanity". It is saying that the verse draws attention to "therefore" and "testify", so its meaning should be read from those terms before moving to application.

The nearby context moves from verse 16's "from whom all the body fitly framed..." into verse 18's "being darkened in their understanding alienated from...", so "therefore" and "testify" belong inside that flow. In Ephesians context, the local focus is grace, union with Christ, the church, and new creation.

A plain takeaway is to answer the verse's own emphasis on "therefore" and "testify" with trust shaped by these words, not by a vague optimism outside the passage.