[507d]
in the absence of which third element the one will not hear and the other
not be heard?” “They need nothing,” he said.
“Neither, I fancy,” said I,” do many others,
not to say that none require anything of the sort. Or do you know of
any?” “Not I,” he said. “But do you
not observe that vision and the visible do have this further
need?” “How?” “Though vision may be
in the eyes and its possessor may try to use it, and though color be
present, yet without
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