Ephesians 4:17

therefore--resuming the exhortation which he had begun with, "I therefore beseech you that ye walk worthy," &c. (Eph 4:1). testify in the Lord--in whom (as our element) we do all things pertaining to the ministry (Th1 4:1 [ALFORD]; Rom 9:1). henceforth . . . not--Greek, "no longer"; resumed from Eph 4:14. other--Greek, "the rest of the Gentiles." in the vanity, &c.--as their element: opposed to "in the Lord." "Vanity of mind" is the waste of the rational powers on worthless objects, of which idolatry is one of the more glaring instances. The root of it is departure from the knowledge of the true God (Eph 4:18-19; Rom 1:21; Th1 4:5).

The apostle having gone through his exhortation to mutual love, unity, and concord, in the foregoing verses, there follows in these an exhortation to Christian purity and holiness of heart and life, and that both more general (Eph 4:17-24) and in several particular instances, Eph 4:25-32. This is solemnly introduced: "This I say therefore, and testify in the Lord; that is, seeing the matter is as above described, seeing you are members of Christ's body and partakers of such gifts, this I urge upon your consciences, and bear witness to as your duty in the Lord's name, and by virtue of the authority I have derived from him." Consider, I. The more general exhortation to purity and holiness of heart and life. 1. It begins thus, "That you henceforth walk not as other Gentiles walk - that for the time to come you do not live, and behave yourselves, as ignorant and unconverted heathens do, who are wholly guided by an understanding employed about vain things, their idols and their worldly possessions, things which are no way profitable to their souls, and which will deceive their expectations." Converted Gentiles must not live as unconverted Gentiles do. Though they live among them, they must not live like them. Here, (1.) The apostle takes occasion to describe the wickedness of the Gentile world, out of which regenerate Christians were snatched as brands out of the burning. [1.] Their understandings were darkened, Eph 4:18. They were void of all saving knowledge; yea, ignorant of many things concerning God which the light of nature might have taught them. They sat in darkness, and they loved it rather than light: and by their ignorance they were alienated from the life of God. They were estranged fRom. and had a dislike and aversion to, a life of holiness, which is not only th…

4:17–5:20 Paul gives believers specific guidelines for living a new life in Christ. 4:17 God’s people are called to a way of life that is different from that of the Gentiles (pagans, unbelievers) of the world.