If we walk around with a self-righteous attitude projecting that we are disciples of Christ, what does Jesus say about that?

Jesus says to us through the Bible passage in 1 John 1:8-9: If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.