1 John 1:8-10 (KJV)
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make him a liar, and his word is not in us.
What is the Trinity?
The Trinity starts with Genesis, chapter 1. When the One True God said let us make man in our image.