1John 1

1John 1:8 & 10
"If we say that we have no sin, we deceive ourselves, and the truth is not in us."
"If we say that we have not sinned, we make Him a liar, and His word is not in us."
These verses spoke to me as when we say that we have no sin in us, we are trying to say that the truth is wrong; that what He said is wrong and at such, denying Him and His word.

1John 1:9
"If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness."
God provided a way for us to cleanse ourselves and be forgiven for our sins through Him, by confessing our sins to Him. He did not demand anything else but a sincere heart to seek Him for forgiveness.