There are two categories of sin: sins against God and sins against man. By default, every sin is against God. Yet, not all sin is against man.
Most people view sin as a private or earthy matter. Yet, every sin is against the Lord. In truth, men can sin against the Father, the Son, and the Spirit.
Sin is not something man does by accident. It is something man does or allows based upon an unwillingness to stop an act before it becomes sin.
