Arguably we are all habitual sinners, unless someone believes that they have never sinned again, even if its simple as back biting.
However, to have sin there must be a law that you have gone against, if there is no law then you cannot sin and then there would be no need for repentance.
“For I say unto you, That except your righteousness shall exceed [the righteousness] of the scribes and Pharisees, ye shall in no case enter into the Kingdom of Heaven.” Matthew 5:20
[you have to be righteous (moral) but again you cannot be morale if there is no law / standard to judge. Everyone has different morals so who decides what’s moral. God says don’t commit adultery, but others say nothing wrong with it as long as both parties agree – has to be law / guidance we have to abide by]
1 Corinthians 5:11 - 11 But now I have written to you not to keep company with anyone named a brother, who is sexually immoral, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner—not even to eat with such a person.
[the above again implies there are Do’s & Donts’ – again implying there is a law / code we must follow – albeit Paul does have many other passages contrary to this and at odds with - Jesus who said - Mark 2:17 - 17On hearing this, Jesus told them, “It is not the healthy who need a doctor, but the sick. I have not come to call the righteous, but sinners.” ]
REV 3:19 "As many as I love, I rebuke and chasten: be zealous therefore, and repent.
[till the end issues of ‘repent’ – you can only repent if you have done something wrong / broken a law – no law no need to repent]
Luke 15:10 - Just so, I tell you, there is joy before the angels of God over one sinner who repents.”