All sin must be rejected and renounced. Holy Christian living and a continual turning away from sin (keeping in step with repentance) is the only way to live a godly life, and is simple proof of the indwelling presence of the Holy Spirit residing in the believer. Unbelievers make a practice of sin, and don’t get sick of doing it. Believers aren’t perfect by any means, but will be sickened by their own sin and will ultimately turn away from it because of the only differentiating factor of the presence of the Holy Spirit.
2 Tim 1:9, Rom 6:1-2, Luke 3:8