(23) And be renewed in the spirit of your mind.--The word translated "renewed" is not the same as the word "new" below. It is properly "to be made young again," and the process of recovery is described as the natural effect of putting off the decrepitude of the old man, and the decay engendered by fleshly lusts. The effect is seen in "the spirit of the mind"--that is, "in the spiritual nature of the inner man." The "spirit" of man is the mind or inner man, considered in its true relation as quickened and sustained by the Spirit of God. (See Romans 8, and especially Ephesians 4:16.) We note, in Colossians 2:18, the opposite condition of "the mind of the flesh," in those who do not "hold the Head." This spirit is spoken of as regaining its undying youth, as it were, naturally, when "the muddy vesture of decay" is cast off.

Verse 23. - And that ye be renewed in the spirit of your mind. Between the first and second practical change, derived from being taught by Christ, the apostle inserts this counsel applicable to both. This renewal is the work of the Holy Spirit; how, then, can it be the subject of an exhortation to us? In this sense, that we are to prize, long for, encourage, watch, this work of the Holy Spirit, feeling it to be most vital and essential, not to be neglected without awful sin and danger. Usually the Holy Spirit works in us by stirring up our spirit to desire and endeavor after holiness; to resist these strivings of the Spirit, or even to be indifferent to them, is a deadly and most dangerous sin.

4:17-24 The apostle charged the Ephesians in the name and by the authority of the Lord Jesus, that having professed the gospel, they should not be as the unconverted Gentiles, who walked in vain fancies and carnal affections. Do not men, on every side, walk in the vanity of their minds? Must not we then urge the distinction between real and nominal Christians? They were void of all saving knowledge; they sat in darkness, and loved it rather than light. They had a dislike and hatred to a life of holiness, which is not only the way of life God requires and approves, and by which we live to him, but which has some likeness to God himself in his purity, righteousness, truth, and goodness. The truth of Christ appears in its beauty and power, when it appears as in Jesus. The corrupt nature is called a man; like the human body, it is of divers parts, supporting and strengthening one another. Sinful desires are deceitful lusts; they promise men happiness, but render them more miserable; and bring them to destruction, if not subdued and mortified. These therefore must be put off, as an old garment, a filthy garment; they must be subdued and mortified. But it is not enough to shake off corrupt principles; we must have gracious ones. By the new man, is meant the new nature, the new creature, directed by a new principle, even regenerating grace, enabling a man to lead a new life of righteousness and holiness. This is created, or brought forth by God's almighty power.And be renewed in the spirit of your mind. Or by the Spirit that is in your mind; that is, by the Holy Spirit; who is in the saints, and is the author of renovation in them; and who is the reviver and carrier on, and finisher of that work, and therefore that is called the renewing of the Holy Spirit, Titus 3:5 or rather the mind of man, which is a spirit, of a spiritual nature, immaterial and immortal, and is the seat of that renewing work of the Spirit of God; which shows, that the more noble part of man stands in need of renovation, being corrupted by sin: and this renewing in it, designs not the first work of renovation; for these Ephesians had been renewed, and were made new creatures in Christ; but the gradual progress of it; and takes in, if not principally intends, a renewal, or an increase of spiritual light and knowledge, of life and strength, of joy and comfort, and fresh supplies of grace, and a revival of the exercise of grace; and in short, a renewal of spiritual youth, and a restoration of the saints to that state and condition they were in, in times past: and the exhortation to this can only mean, that it becomes saints to be concerned for such revivings and renewings, and to pray for them, as David did, Psalm 51:10 for otherwise, this is as much the work of the Spirit of God, as renovation is at first; and he only who is sent forth, and renews the face of the earth, year by year, can renew us daily in the Spirit of our minds.