'Nature' in the Bible

We who are Jews by nature, and not sinners of the Gentiles,

Howbeit then, when ye knew not God, ye did service unto them which by nature are no gods.

But we see that the child of the slave-girl was born in the common course of nature; but the child of the free woman in fulfilment of the promise.

Yet just as, at that time, the child born in the common course of nature persecuted the one whose birth was due to the power of the Spirit, so it is now.

But I say, walk habitually in the [Holy] Spirit [seek Him and be responsive to His guidance], and then you will certainly not carry out the desire of the sinful nature [which responds impulsively without regard for God and His precepts].

For the sinful nature has its desire which is opposed to the Spirit, and the [desire of the] Spirit opposes the sinful nature; for these [two, the sinful nature and the Spirit] are in direct opposition to each other [continually in conflict], so that you [as believers] do not [always] do whatever [good things] you want to do.

And those who belong to Christ Jesus have crucified the sinful nature together with its passions and appetites.

For the one who sows to his flesh [his sinful capacity, his worldliness, his disgraceful impulses] will reap from the flesh ruin and destruction, but the one who sows to the Spirit will from the Spirit reap eternal life.

For neither is circumcision anything [of any importance], nor uncircumcision, but [only] a new creation [which is the result of a new birth—a spiritual transformation—a new nature in Christ Jesus].