Grace & Peace!
I think you may be misunderstanding when it’s written that sin is its own punishment. Sin can be incredibly gratifying. And weaning ourselves off of sin can be incredibly painful. The nature of sin, though, in and of itself–simply due to the way the universe was made, and due to the nature of the Living God–is death. Because what sin is, in itself, is separation from God. The separation is not a consequence of sin. The separation is of the nature of sin itself.
Because to sin means (as Origen would write) to put oneself outside the recollection of God. It is to deify oneself above God. This deification, however, is purely illusory. God’s position in the universe is not challenged by our vaunting sinful hubris. But through sin, we focus on ourselves, on our empty ego, rather than on who we really are. And who we really are, according to the church, is found in God. We are what God knows us to be. And because of the love of Christ, our humanity has been joined to God’s Divinity in such a way that what we are, what we truly are, is discovered to be Christ.
When we sin, we deny what we are. We cling to a sinful nature. But because sin has no part in God, and because God is the source of all life and all being, it should come as no surprise that sin puts us on the path of destruction, the path of not-life, the path of not-being, because the act of sin is an act of identification–I identify with the sin through my act. I therefore take on the quality of sin–which quality is death–not-life, not-being, not-God. I therefore deface the image of God in me. I destroy life in me. I seek to undo my very being when I sin. Because sin has no part in God from whom all being comes.
This is what is meant by sin is its own punishment. God does not need to do anything for us to reap in our very souls the fruit of death. Sinning may be fun. It may be enjoyable. But that does not mean that it has no lasting spiritual consequence or that its nature is fun or enjoyable. What is passing discomfort, what is physical pain, what are even the purifying fires of purgatory (which is not punishment, but purification) compared to the active will to remove from oneself the ground of one’s very life, compared to the relentless tearing away, by oneself through sin, at the fabric of one’s being? What more consequence, what more punishment do you want?
Under the Mercy,
Mark
Deo Gratias!