NET
17 So I say this, and insist in the Lord, that you no longer live as the Gentiles do, in the futility of their thinking.
Darby
17 This I say therefore, and testify in [the] Lord, that ye should no longer walk as [the rest of] the nations walk in [the] vanity of their mind,
KJV
17 This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,