Mark 9:47
And if thine eye offend thee, pluck it out: it is better for thee to enter into the kingdom of God with one eye, than having two eyes to be cast into hell fire: And if thine eye offend thee, pluck it out: it is better for thee to enter into the kingdom of God with one eye, than having two eyes to be cast into hell fire:
The offending eye stands for anything that causes a person to stumble, including any cherished habit or practice that leads into sin and dishonors Christ, and including the will itself that holds sin in place. Gehenna evokes a place of terrible suffering. It is better to enter life with painful loss than to cling to what causes stumbling and be cast into hell fire.
What causes stumbling must be surrendered to God and put away with utmost earnestness and decisive action at great personal cost, just as a person would remove an eye to save the body from death. Hidden sin cannot be concealed from God. Refusing to separate from sin is choosing death, because God's presence consumes sin and consumes the person who clings to it.
Such cherished sin brings death to the soul and can also mislead others, so the warning is especially urgent against harshness or coldness toward someone Christ is drawing, which can turn that person away and cause the loss of a soul. The undying worm and unquenched fire describe the fate of everyone who has joined himself to Satan by cherishing sinful traits, persisting in sin, refusing to forsake sin, and despising forgiveness and grace. Sin is the transgression of God's law that cuts the soul off from God under His wrath, which the sinner realizes too late.
Those who refuse salvation will experience remorse and despair. They will also feel hatred and bitterness against God. The fire is unquenchable in the sense that it brings the sure consequence of transgression, destroying soul and body of every unrepentant sinner.