I recently got into a very bad argument with someone who told me that they no longer consciously sin which threw me off. I brought up 1 John 1:8, but they said that I was wrong about my use of the verse. They got upset when I brought up something they had done to me in the past and essentially called me a liar because they no longer consciously sin and wouldn’t have done that. Is it really possible to no longer consciously sin?
Christians who deny that they still consciously sin have to reinterpret 1 John 1:8-10 to accommodate their erroneous belief. As evidence that believers still sin, Paul gave us insight into his personal struggle with sin (Romans 7:14-25).
In your case, the person lied about his or her behavior to your face, even though you had personally witnessed it. This adds another sin to the first one.