What is SIN?

In essence sin is missing the mark, God’s mark. Anything that is outside the will of God is sin. This makes the category of what would fit as being sin very large. Nearly all people when thinking of sin think of actions such as stealing, lying, murder, or other things of that nature. But these things are all tangible things. I don’t think of sin as being tangible at least in the sense of it being physical. Maybe the effects of sin are tangible, but the sin itself I don’t think so. What if all these things that people see as sin are actually just a physical representation of the sin but not actually sin itself? What if the actual sin takes place at the level of our heart? So that when I steal something, its not the action of me taking something that doesn’t belong to me that is the sin, but my heart, in essence, telling God, “I don’t care what You want, I’m doing things my way”. The action then is just the outward expression of what has just taken place in my heart. When you boil it down all sin is the same in that it is a willful defiance of your heart against God.