It has been well said that if there is anything good in any man it is because it was put there by God. And something good — a new, sinless nature — has been imparted by God to every believer.
While there is still within us “that which is begotten of the flesh,” there is also “that which is begotten of the Spirit,” and just as the one is totally depraved and “cannot please God,” so the other is absolutely perfect and always pleases Him.
Adam was originally created in the image and likeness of God, but he fell into sin and later “begat a son in his own likeness, after his image” (Gen. 5:3). It could not be otherwise. Fallen Adam could generate and beget only fallen, sinful offspring, whom even the Law could not change. But “what the law could not do, in that it was weak through the flesh, God, sending His own Son in the likeness of sinful flesh, and for sin,” accomplished, “that the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit” (Rom. 8:3,4),
As Adam was made in the likeness of God, but fell, so Christ was made in the likeness of sinful flesh, to redeem us from the fall, that by grace, through the operation of the Spirit, a new creation might be brought into being, a “new man… renewed in knowledge after the image of Him that created him” (Col. 3:10) a “new man, which, after God is created in righteousness and true holiness” (Eph. 4:24). Referring to this “new man,” John says:
“Whosoever is born [begotten] of God doth not commit sin, for his seed remaineth in him: and he cannot sin, because he is born [begotten] of God” (I John 3:9).
“We know that whosoever is born [begotten] of God sinneth not…” (I John 5:18).