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, they should not talk about them.
 C. S. Lewis, Mere Christianity (1952). copy citation

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Author C. S. Lewis
Source Mere Christianity
Topic eternity understanding
Date 1952
Language English
Reference
Note Adapted from a series of BBC radio talks made between 1942 and 1944
Weblink https://www.dacc.edu/assets/pdfs/PCM/merechristianitylewis.pdf

Context

“I must keep alive in myself the desire for my true country, which I shall not find till after death; I must never let it get snowed under or turned aside; I must make it the main object of life to press on to that other country and to help others to do the same.’
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, they should not talk about them. All the scriptural imagery (harps, crowns, gold, etc.) is, of course, a merely symbolical attempt to express the inexpressible. Musical instruments are mentioned because for many people (not all) music is the thing known in the present life which most strongly suggests ecstasy and infinity.” source