They profane His blood treating it as common or cheap (they basically treat the Blood of Jesus Christ as the blood of goats and bulls which was never able to wash away sins completely).
The true Christian “escapes the corruption in the world caused by evil desires” (1:4). Counterfeit Christian, “promise . . . freedom, while they themselves are slaves of depravity, for a man is a slave to whatever has mastered him” (2:19). The true believer is escaping corruption, while the counterfeit believer is mastered by it.
There is a partial sanctification or else He wouldn’t say, “may God of peace Himself sanctify you entirely or completely.”