Any time anyone sins its willful whether or not the person is saved or not. Any believer who sins does it willfully. There are also 2 classes of sins, the sins of commission and sins of omission.
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It's not us wanting to sin, but the "old man," and we are no longer a part of it (Ro8:9). The primary difference between our sinning before rebirth and after rebirth is in our desires. Before it was our desire, because we were dominated by the sin nature (Ro 6:14), we didn't have the desire to "please God" (Phl 2:13) until He "worked" this in us! This answers to Paul demonstrating the difference between him in his new "I" and old "I" (Ro 7:17, 20).
John Gill: "but I am carnal, sold under sin." from hence to the end of the chapter many are of opinion, that the apostle speaks in the person of an unregenerate man, or of himself as unregenerate; but nothing is more clear, than that he speaks all along of himself in the first person, "I am carnal," "I myself," as in
Romans 7:25, and in the present tense of what he then was and found; whereas, when he speaks of his unregenerate state, and how it was with him under the first convictions of sin, he speaks of them as things past,
Romans 7:5; besides, several things which are said by the apostle can neither agree with him, nor any other, but as regenerate; such as to "hate evil," "delight in the law of God," and "serve it with the mind,"
Romans 7:15. Moreover, the distinctions between flesh and spirit, the inward and the outward man, and the struggle there is between them, are to be found in none but regenerate persons; and to say no more, the thanksgiving for deliverance from sin by Christ can only come from such; nor are any of the things said inapplicable to men that are born again, as will appear by the consideration of them as they follow: for when the apostle says, "I am carnal"; his meaning is, either that he was so by nature, and as he saw himself when sin through the law became exceeding sinful to him; or as he might be denominated from the flesh or corruption of nature which was still in him, and from the infirmities of the flesh he was attended with; just as the Corinthians, though sanctified in Christ Jesus, and called to be saints, are said to be "carnal" on account of their envying, strife, and divisions,
1 Corinthians 3:1, or in comparison of the "spiritual" law of God, which was now before him, and in which he was beholding his face as in a glass, and with which when compared, the holiest man in the world must be reckoned carnal. He adds, "sold under sin"; he did not "sell himself" to work wickedness, as Ahab,
1 Kings 21:25, and others; he was passive and not active in it; and when at any time he with his flesh served the law of sin, he was not a voluntary, but an involuntary servant; besides, this may be understood of his other I, his carnal I, his unrenewed self, the old man which is always under sin, when the spiritual I, the new man, is never under the law of sin, but under the governing influence of the grace of God.
Paul sinned against his will (unwilful), which is what he meant by being a "captive" (v23); he never desired to sin after being saved, but since we still have the sin nature, we will still sin, just never willfully (Heb 10:26). Paul said his sins are no longer what he wanted to do (v15).
