A proud man is always looking down on things and people: and, of course, as long as you are looking down, you cannot see something that is above you. - C. S. Lewis

If we insist on keeping Hell (or even earth) we shall not see Heaven: if we accept Heaven we shall not be able to retain even the smallest and most intimate souvenirs of Hell.

Now sir, said the bulldog in his business-like way. 'Are you a animal, vegetable, or mineral?'
- The Magician's Nephew

[Mortals] say of some temporal suffering, "No future bliss can make up for it," not knowing 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.