I once had a christian tell me, "I don't want to live a pure life because my co-workers and friends would feel like I'm judging them." This is the thought I'm addressing in this post.
Sin has two or more parts, the act and the motives. One part is the sinful part, which is the act of sin. The other part is the reason for the act. True sin is committed with intention. A person intended to do the act. When we speak of intention, we also speak of a pattern of wrongful thinking.
I've wondered for a long time about the seeming contradiction between 1John 3:9 and 5:18 "He.... does not sin" .... and the modern day Christian teaching that "we are just sinners saved by grace."