Aristotle - The Organon - index for DE INTERPRETATIONE Book 1 Part 1

Language, thought, truth

Paragraph 1 First we must define the terms 'noun' and 'verb', then the terms 'denial' and 'affirmation', then 'proposition' and 'sentence.'
Paragraph 2 Spoken words are the symbols of mental experience and written words are the symbols of spoken words.
Paragraph 3 As there are in the mind thoughts which do not involve truth or falsity, and also those which must be either true or false, so it is in speech.

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