The scriptures clearly teach that salvation is for the faithfully obedient.
Heb. 5:9“And having been made perfect, He became to all those who obey Him the source of eternal salvation”
So we boldly deny and decry the doctrine of “once saved always saved.” As a result of this constant teaching and our desire to live circumspectly, or biggest problem with sin is not members living openly it —not that it never happens, but it is the exception—rather is is living in sin in ways that few, especially the brethren, will ever know about.
The consequences of this is the appearance of holiness without it’s real substance or power. It is hypocrisy to knowingly continue in this situation. The only cure is to whole-heartedly seek the things of God:
Heb. 12:14-16“Pursue peace with all men, and the sanctification without which no one will see the Lord. See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled; that there be no immoral or godless person like Esau, who sold his own birthright for a single meal.”
Sanctified hearts are necessary. But sanctified hearts are wrecked when there is bitterness or any sin in the heart. All can see that when it’s done openly. But it works just the same if you cover it up.