And you shrieked, ’Knowledge is power!’ and ’A dwarf on a giant’s shoulders of the furthest of the two!’ and I summed my side up with rare serenity in, ’The folly of mistaking a metaphor for a proof, a torrent of verbiage for a spring of capital truths, and oneself as an oracle, is inborn in us, Mr. Valery once said.’
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He was speaking metaphorically when he referred to being mugged by reality.
It was falling so hard that it looked like white sparks (and this is a simile, too, not a metaphor).
Mark Haddon -- The Curious Incident of the Dog in the Night-time