Ephesians 4:17

Τοῦτο οὖν λέγω καὶ μαρτύρομαι ἐν Κυρίῳ, μηκέτι ὑμᾶς περιπατεῖν, καθὼς καὶ τὰ λοιπὰ ἔθνη περιπατεῖ ἐν ματαιότητι τοῦ νοὸς αὐτῶν,

Toyto oyn legō kai martyromai en Kyriō, mēketi ymas peripatein, kathōs kai ta loipa ethnē peripatei en mataiotēti toy noos aytōn,

King James Version (KJV)

This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,

Modern English

So I tell you this, and insist on it in the Lord, that you must no longer live as the Gentiles do, in the futility of their thinking.