I guess you know this refers to habitual sin (with no repentance).
The occasional sin is covered by confessing and repenting (stopping)..
Did God remove Adam and Eve from Paradise for habitual sin or one willful sin? The Saints of God do not willfully sin because God's Word abides in their hearts. Should they willfully sin, they have fallen from Grace; but, restoration is possible through sorrowful repentance.
Let this music video bless you about this matter.
[10] In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.BTW, did you have a reason for omitting the critical verse 10?