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Upon encountering the title of this article one’s first thought might seem negative about it, but with all who become “born again” there is a period of growth that involves learning in the Word of God about the “old man,” which is the sin nature first seen in Adam and Eve, then in the entirety of their progeny—mankind (Rom 5:12-19). Upon rebirth the soul becomes “spiritually minded,” due to the imparting of the Spirit of God and the new nature (new man); and the old man continues to become more obviously identifiable so that we can continue to be taught by it—through the contrast of it with the new man!
Thus, it’s our position in Christ that will mature our walk in Christ, as the carnality will be seen to progressively decrease, as our spirituality increases, thereby maturing from a carnal Christian to a spiritual Christian (1Co 3:1); which within the last few generations requires much time due to the multitude of errant Biblical doctrines, resulting (in my opinion) from the lack of fundamental spiritual-growth-centered teachings (and just not enough Word-time reading and studying).
Thus there now coexists two natures in the soul of the believer, the old man and the new man; and through these both God’s school of godliness is taught, by which those reborn will all “be conformed to the image of His Son” (Rom 8:29), and thereby “grow up into Him in all things” (Eph 4:15).
All believers will pass through the “babe-in-Christ” stage (1Co 3:1), for though Christ is in you at rebirth, He is in not yet “formed in you” (Gal 4:19), that is, “unto a perfect man” (mature-in-Christ Eph 4:13), which concerns our “walk” or lifestyle. Redemption-wise believers are complete in Christ, which the lifestyle will manifest more all the time of what we already are in Christ.
As long as we are presently earthly bound we can never be completely free of carnality, which always remains to some degree or another, due to the indwelling of the old man; but this has no effect on our fully redemptive position in Christ, only on our growth in the strength of our faith. “Through faith,” grace came to us, and it is through the strengthening of our faith (only via the studying of Word of God by His Spirit) that we are able to “grow in grace, and in the knowledge of our Lord and Savior Jesus, the Christ” (2Pe 3:18).