Ephesians 4:17

17 This then I say and testify in the Lord: That henceforward you walk not as also the Gentiles walk in the vanity of their mind:

Ephesians 4:17 In-Context

15 But doing the truth in charity, we may in all things grow up in him who is the head, even Christ:
16 From whom the whole body, being compacted and fitly joined together, by what every joint supplieth, according to the operation in the measure of every part, maketh increase of the body, unto the edifying of itself in charity.
17 This then I say and testify in the Lord: That henceforward you walk not as also the Gentiles walk in the vanity of their mind:
18 Having their understanding darkened: being alienated from the life of God through the ignorance that is in them, because of the blindness of their hearts.
19 Who despairing have given themselves up to lasciviousness, unto the working of all uncleanness, unto covetousness.
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