I understand. You mean if you think you are doing well. And that can be a sin.

With regard to self-righteousness, it can lead to pride. And pride is the original sin. The origin of everything.

The problem of believing to have the absolute truth is that it makes us arrogant, and the lack of humility prevents us from continuing to learn and grow spiritually.

I hope this answers your question.

It is an honor for me to answer your questions. Have a great day.