We can know all those things about physical space which a man born blind might know through other people about the space of sight; but the kind of things which a man born blind could never know about the space of sight we also cannot know about physical space. We can know the properties of the relations required to preserve the correspondence with sense-data, but we cannot know the nature of the terms between which the relations hold.
What does the words "terms" and "hold" in this context mean?
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Good question. "Hold" means "are valid, are true". According to the last bit, the relations hold between terms.
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Good question. "Hold" means "are valid, are true". According to the last bit, the relations hold between terms. That makes me think he is borrowing from the field of logic, considering a property of real space and an idea about the same thing as the variables in a proposition. We can say a thing is "there", but we cannot know what "there" really means or even exactly what we mean by it. I'm tr