The following is on my rotating quotes list (to the right). I wanted to call attention to it, because I think it's spot-on. I've seen the proof in my life already.

"Son,'he said,' ye cannot in your present state understand eternity...That is what mortals misunderstand. They say of some temporal suffering, "No future bliss can make up for it," not knowing that Heaven, once attained, will work backwards and turn even that agony into a glory. And of some sinful pleasure they say "Let me have but this and I'll take the consequences": little dreaming how damnation will spread back and back into their past and contaminate the pleasure of the sin. Both processes begin even before death. The good man's past begins to change so that his forgiven sins and remembered sorrows take on the quality of Heaven: the bad man's past already conforms to his badness and is filled only with dreariness. And that is why...the Blessed will say "We have never lived anywhere except in Heaven, : and the Lost, "We were always in Hell." And both will speak truly."— C.S. Lewis