There are those that claim they have the power to not sin in the flesh. They never say they sin in the flesh because that would show they do not really have that power. Since they think they no longer sin they have nothing to repent of.
As a Matter of fact they make God a liar because God has said all mankind sins and those who claim they don't are liars.
1 John 1:8-10
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make Him a liar, and His word is not in us.
NKJV
As a Matter of fact they make God a liar because God has said all mankind sins and those who claim they don't are liars.
1 John 1:8-10
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make Him a liar, and His word is not in us.
NKJV