I and others have sometimes struggled with the reality of a loving a merciful God permitting souls to go to Hell for all eternity. It seems contrary to His essence. A friend of mine pointed me to this article from Crisis Magazine entitled "Sympathy for the Devil and Mercy for the Damned". It's a dialogue - fictional, to be sure - that I think helps to shed some light on this. Well-written, worth the read, and thought-provoking!