Q. Is willful sin the same as practicing sin? If not, then what is the difference?
A. To willfully sin is to sin consciously, with volition. The concept of practicing sin is similar to that of practicing medicine or law. It means the person is actively engaged in it on a consistent basis. A person can willfully sin on an infrequent or inconsistent basis and therefore not be thought of as practicing sin. So it’s a matter of how much it becomes a part of the person’s life
I believe this is what Paul was talking about what he said, “Those who live according to the flesh have their minds set on what the flesh desires; but those who live in accordance with the Spirit have their minds set on what the Spirit desires” (Romans 8:5). If you begin each day with your mind set on fulfilling the desires of the flesh, instead of seeking the Lord’s will for your life, you are most likely practicing sin.