This is not correct.
To understand the human nature, it is necessary to consider Adams position towards it, and the influence that sin had on the human nature as a whole. Adams sin caused sin to reign in this world. Sin reigned by one mans offence (Rom 5:17). This was the result of the curse of God in Gen 3:17. Everybody died in Adam corporately (1 Co 15:22). In the same way, everyone who is resurrected to eternal life is resurrected in Christ corporately (see for example the interesting parallel between 1 Co 15:22 and Col 2:11-15). It has everything to do with the condition in the flesh or the human nature (sarx). Since Adam's sin, mans nature is corrupt (cf. the parallel with Adams discovery of his nakedness: Gen 3:7). On the question if there is a correlation between the human will and nature, the interpretation of Rom 7 is decisive:
The well-known saying of Paul:I do not do the good that I desire; but the evil which I do not will, that I do, is often used to express a general struggle in a believers live. But exegesis of the inherent structure of Rom 7 shows that Paul describes the condition of the man in the flesh (the unconverted man) (see Ridderbos:1966). There are textual markers that point that out. Verse 5, that says: when we were in the flesh stands in contrast to verse 6: But now we have been set free from the Law, having died to that in which we were held. He makes a clear distinction between the two conditions or ways of existence. From verse 9 to verse 25, Paul elaborates on the condition of the old man. In the whole portion his thrust stays the same. Verse 9 says: I was alive without the law once. In verse 14, he speaks about the condition as carnal and sold under sin (that means that he has not been redeemed by the blood of Christ). The same is true of verse 18: I know that in me (that is, in my flesh) dwells no good thing. The Spirit of God obviously does not live in him yet. In verse 24 he says: O wretched man that I am! Who shall deliver me from the body of this death? I thank God through Jesus Christ our Lord! This is a cry for salvation. The body of this death is in this context the wretched and unsaved condition that longs for deliverance. In verse 25b he refers to the condition that he has just described. So then
I myself serve. Verse 25b says the same as verse 18, only in other words.
Some interpret verse 25b as the condition of the new man, as it follows chronologically after the sigh for deliverance (verse 24), and understand verse 18 also as the condition of the new man (for verse 25b and 18 corresponds). This cannot be maintained, for Rom 8 removes any possible ambiguity. Here is a definite turning point: There is therefore now no condemnation to those who are in Christ Jesus. Now the condition of the new man is being discussed in contrast to Rom 7, where the condition of the old man has just been discussed. Rom 8:9 says for example: You are not in the flesh. It stands in contrast to Rom 7:14 that says:
I am carnal
and verse 18 that says: I know that in me (that is, in my flesh) dwells no good thing.
In this light then (the fact that Rom 7:9-25 is about the old man), the relation between will and nature is clarified.
In 7:18 Paul says that to will (to do good) is present with him, but he cannot perform it. In verse 25b, which is a summary of the old man, he talks about his mind (parallel with verse 18-19: that is his will) that serves the Law of God, but with his sinful nature, he serves the law of sin. Paul therefore explains the condition of the old man as a condition where the will to do good is present, but the ability to perform it, is not present (because of the sinful nature that still prevails). In this way, he distinguishes clearly between will and nature.
The implication of this is two-fold:
1. The human nature can be measured in a polar way (good versus bad or saved versus unsaved). The human nature is the determining factor to mans destination. Someone that is and stays in the sinful nature, will be lost, but someone of whom the sinful nature has been removed, (Col 2:11), is saved and has eternal life.
2. The will is on a different level than the human nature. It has to do with his choice, but it does not categorise man regarding his destination. The same will (that wants to do good) is both present with the saved and unsaved. One can only look at the modern conscience to conserve nature, to eat right, or to maintain world piece. In fact, Rom 2:14-15 shows that the Gentiles who have no Law, they do the things of the Law naturally, for their conscience also bear witness, and the thoughts between one another accuse or even excuse one another.
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