C.S. Lewis, The Problem of Pain (HarperOne; 2001), page 149:
There have been times when I think we do not desire heaven; but more often I find myself wondering whether, in our heart of hearts, we have ever desired anything else.
Peter Kreeft, Heaven: The Heart’s Deepest Longing (Ignatius; 1989), pages 43–44:
Take an hour or so to do this experiment, not just read about it. (The simple act of taking an hour away from external diversions for inner confrontation with your heart, no matter what comes of it, may he the hardest part of the experiment — and also the most valuable and desperately needed in your hectic life.)
Ask your heart what it wants. Make a list. The sky’s the limit.
Now imagine you are God; there is no limit to your power. Design your own heaven and then give it to yourself.
First imagine what you want. Then imagine getting it all. Finally, imagine having it for eternity. How soon do you think you would grow bored or restless?
Suppose your first list wasn’t very profound. Try again. Go deeper this time: not pleasure and power and fame and money and leisure, say, but good friends and good health and intelligence and a good conscience and freedom and peace of mind. That might take a few more millennia to bore you, perhaps. But aren’t all imaginable utopias ultimately boring? In fact, aren’t the most perfect ones the most boring of all? Doesn’t every fairy tale fail at the end to make “they all lived happily ever after” sound half as interesting as the thrills of getting there?
Can you imagine any heaven that would not eventually be a bore? If not, does that mean that every good thing must come to an end, even heaven? After eighty or ninety years most people are ready to die; will we feel the same after eighty or ninety centuries of heaven? Would you have to invent death in your ideal, invented heaven? What a heaven — so wonderful you commit suicide to escape it!
But if we don’t want death and we don’t want boredom in heaven, what do we want? If heaven is real, what real desire does it satisfy? And even if it is unreal, only wishful thinking, what is the wish? What do we want?
We want a heaven without death and without boredom. But we cannot imagine such a heaven. How can we desire something we cannot imagine?
Our desires go far deeper than our imagination or our thought; the heart is deeper than the mind.
You make known to me the path of life; in your presence there is fullness of joy; at your right hand are pleasures forevermore.