Philosophically, sin is an impossibility. How can that which is against the will of God (sin) exist in objective reality, when God is omniscient, omnipresent and omnipotent? Sin can only exist in this illusionary framework of temporal space, which is constricted, subject to termination and scheduled for rectification.
The grace of God allows this illusion for merely a second, because of the possibilities of redemption and the potential therein. A time is coming, and shortly, when reality will come back a-knocking, and nothing that stands in opposition to the will of God will stand any longer. That ultimate reality check, we call hell.
Some folk wonder how a loving God could put living human beings into a fiery lake forever. I don't know what other possibility could exist. They usually think that, even if the lake is real, it cannot possibly be so forever. Sometime, the flame has to go out, and the worm metamorphose and fly away to bigger and better things. All of us who are parents, or who had parents, realize that punishment ends sometime, right? No, such thoughts arise from a misunderstanding of human and angelic nature, sin and independent wills.
Ultimately, how can any will exist but that which is omnipotent? For any other will to exist contemporaneously and/or permanently would undermine the nature of the supposedly omnipotent one. It would in fact, then, not be omnipotent, but impotent-- capable of conceiving but not delivering.
Why does that make hell necessary? Well, human and angelic will cannot be disposed of nor dissolved. If everything in nature reveals something about the invisible attributes of God, think about what the conservation of mass and energy tell us about the Spirit of God-- He cannot be created nor destroyed. Furthermore, what he lends breath, or personal spirit to, though it can be established in independence (created), once granted such, cannot be destroyed either. Humans and angels (although I don't have a scripture reference for angels, it does make sense to me) fall into that category.
They cannot be destroyed, once established, but they can be disabled. How? Overwhelm their will with incessant fire and they will never entertain a thought, nor devise a scheme, nor hatch a plot in opposition to God's will again. Don Piper's experience of a painful recovery after a traffic accident is helpful here:
In the first few weeks of my recovery, I was in such constant physical pain I couldn't hold any thoughts in my mind for more than a second or two (from 90 Minutes in Heaven, p. 102)One long "arrrrgh!" will be their lot, cosmic pink noise. Coherent thought will be impossible, no conceptions nor communications. Their eternal will is silenced in perpetual flames: God's will continues unabated. It has to be.
God created us with divine-like capacities in order to fellowship with him. Christ reveals in flesh and bone, in spirit and in thought what that looks like. It’s not oppressive nor coercive, but food and life, joy and peace. Our wills are meant to be experienced as the replication and expression of his. Exertion of our will (works) is not the means to achieve that, inspiration is [my next post]. As for sin, to hell with it!