"Humans are amphibians - half spirit and half animal. As spirits they belong to the eternal world, but as animals they inhabit time."I can't help but add what Lewis writes just a bit further in this last passage: "There is no need to be worried by facetious people who try to make the Christian hope of 'Heaven' ridiculous by saying they do not want 'to spend eternity playing harps.' The answer to such people is that if they cannot understand books written for grown-ups, then they should not talk about them . . . People who take these symbols literally [harps, crowns, gold, etc.] might as well think that when Christ told us to be like doves, He meant that we were to lay eggs."
" . . . we are so little reconciled to time that we are even astonished at it. 'How he's grown!' we exclaim, 'How time flies!' as though the universal form of our experiences were again and again a novelty. It is as strange as if a fish were repeatedly surprised at the wetness of water. And that would be strange indeed; unless of course the fish were destined to become, one day, a land animal."
"The Christian says, 'Creatures are not born with desires unless satisfaction for those desires exists. A baby feels hunger: well, there is such a thing as food. A duckling wants to swim: well, there is such a thing as water. Men feel sexual desire: well, there is such a thing as sex. If I find in myself a desire which no experience in this world can satisfy. The most probable explanation is that I was made for another world."