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What is sinful nature?

tonychanyt

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NIV, Ro 7:

18 For I know that good itself does not dwell in me, that is, in my sinful nature.
NIV note: Or my flesh*

The exact phrase "sinful nature" is not found in any original biblical manuscripts. ESV:

For I know that nothing good dwells in me, that is, in my flesh [G4561].
On Biblehub, only 2 versions used 'sinful nature' while 36 said 'flesh'.

Was the word G4561-flesh always negative?

No, Jesus said in Matthew 19:

5b ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh
G4561 σάρξ (sarx), BDAG:

① the material that covers the bones of a human or animal body, flesh
② the physical body as functioning entity, body, physical body
③ one who is or becomes a physical being, living being with flesh
The lexical definition of sarx is morally neutral. However, the word was often used in contrast to the spirit. Matthew 26:

41 “Watch and pray so that you will not fall into temptation. The spirit is willing, but the flesh is weak.”
Paul used "spirit" 22 times and "flesh" 14 times in Romans 8:

Is our flesh sinful by nature?

Not exactly. Paul used the term flesh here both literally (neutrally) and metaphorically (negatively). Compared to the spirit, the flesh is weak and tends to sin. Metaphorically, it represents the human fleshly and carnal sinful nature. More negative metaphors follow:

Why was the flesh sinful by nature?

By flesh, Paul contrasted it with the spirit. In that sense, it is sinful by nature. In the literal physical sense of the word flesh, it is neutral and not necessarily sinful by nature, as Jesus himself took on flesh to become a man.

Christians often overload the concept of sinful nature. The phrase is not found in the Bible. I'd avoid it in argumentation. However, it is a nice shorthand notation to summarize the biblical teaching on humanity's inherent tendency toward sin. The concept is present in Scripture, conveyed through terms like sarx (flesh), palaios anthropos (old self), and lev/kardia (heart). Humanity is naturally inclined to sin, and redemption through Christ is necessary to overcome this tendency of sinful nature.

See also

 
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Hoping2

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Does the word flesh always refer to the sinful nature?
Does it ?
"Flesh" has two uses in scripture.
One is just skin and bones, tendons and blood vessels...a body.
The second use of "flesh" pertains to the worldly oriented mind.
The second usage would be the one that may be seen as a sinful nature.

When I use the word flesh in my writings, I always use quotation marks around "flesh" when referring to the second usage...the worldly oriented mind.
 
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Diamond72

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Jesus said in Matthew 19: 5b ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh
God divided them into male and female so He could unite them back together again in Him. We are all born into this world because of the union of a male and a female that united becomes one.
 
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