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“the more 'life' a story has the more readily will it be susceptible of allegorical interpretations” Letter 131.
"I have purposely kept all allusions to the highest matters down to mere hints, perceptible only by the most attentive, or kept them under unexplained symbolic forms." Letter 156.
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Then at last his gaze was held:
wall upon wall,
battlement upon battlement,
black,
immeasurably strong,
mountain of iron,
gate of steel,
tower of adamant,
he saw it:
Barad-dur,
Fortress of Sauron.
All hope left him.