 Bertrand Russell Quotes 366 |
We must not say, " 'This is red' and 'This is not red' cannot both be true," since we are concerned to eliminate "not." We must say, "A disbelief in the sentence 'The belief that this is red and the disbelief that this is red are both true' is always true." It seems that in this way we can replace "not" and "falsehood" by "disbelief" and "the truth of a disbelief." We then reintroduce "not" and "falsehood" by definitions: the words "This is not blue" are defined as expressing disbelief in what is expressed by the words "This is blue." In this way the need of "not" as an indefinable constituent of facts is avoided.
Source: Human Knowledge, 1948.
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