The following excerpts are from the maestro himself...

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Most good “fairy-stories” are about the adventures of men in the Perilous Realm or upon its shadowy marches. Naturally so; for if elves are true, and really exist independently of our tales about them, then this also is certainly true: elves are not primarily concerned with us, nor we with them.

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And lastly there is the oldest and deepest desire, the Great Escape: the Escape from Death. Fairy-stories provide many examples and modes of this—which might be called the genuine escapist, or (I would say) fugitive spirit. But so do other stories (notably those of scientific inspiration), and so do other studies. Fairy-stories are made by men not by fairies. The Human-stories of the elves are doubtless full of the Escape from Deathlessness.