Christians Have One Nature, Not Two

QUESTION: How would you answer the assertion that every Christian has two natures, that of the old Adam, which until physical death lives and sins day by day without ceasing, and that of the second Adam, the Lord Jesus, which nature cannot sin?

ANSWER: The Christian has only one nature called human. This nature is a fallen nature redeemed and reconstructed more or less perfectly, according to one's faith. But it has from the moment of the new birth the gracious ability to be victorious over every temptation and to verify John's description, "Whosoever has been born of God (perfect tense implying the continued similarity to God) is not sinning, because his seed (love divine) continues in him and he cannot be sinning because he has been begotten of God" (perfect tense including the present). That our annotated American version gives the exact meaning of the original is confirmed by the Twentieth Century Version, "No one who has derived his life from God acts sinfully, because God's very nature is always within him and he cannot live in sin, because he has derived his life from God." This precludes a career of sinning by a child of God, but it does not preclude the possibility of a single wrong act under the stress of sudden temptation, as in I John 2:1, "If any man sin (the tense denoting a single act) we have an Advocate," etc.

— Steele's Answers pp. 99, 100.