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J.R.R. Tolkien and C.S. Lewis
The two literary giants were close friends and sent each other regular letters: from witty one-liners to more detailed thoughts on future projects. In one, Lewis asks "Tollers" if God exists, to which he simply replies, "I think you'll find that God, naturally, exists." Although their friendship waned in later years, on hearing of Lewis' death, Tolkien said it "feels like an axe-blow near the roots."

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