I think that until we really realize what life is like without God, this almost literally Godforsaken earth we've advocated for since the beginning of time, it would be impossible for us to truly understand that an eternity of perfect communion with God and each other is the only antidote to this aching pain we have deep within us. Once we get to heaven and our sinful, selfish blinders are removed, I don't think we'd have eternity any other way.
Even though [Arakiel's] virtuous displays are few and far between, they occur enough to make Lucifer wonder whether his brother has gone soft. Lucifer only intended to start a war, not a silly romance between an angel and a demon. He orders Bethany to be burned at the stake in front of an audience of demons and lost souls, but not even hellfire can destroy the young angel.