C.S. Peirce • Relatives of Second Intention | Inquiry Into Inquiry: " By logical reflexion, I mean the observation of thoughts in their expressions. Aquinas remarked that this sort of reflexion is requisite to furnish us with those ideas which, from lack of contrast, ordinary external experience fails to bring into prominence. He called such ideas second intentions. Is is by means of relatives of second intention that the general method of logical representation is to find completion.
— Charles S. Peirce, “The Logic of Relatives”, The Monist, vol. 7, 161–217, (1897).
Reprinted, CP 3.456–552."
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Charles Sanders Peirce - Thinking in Threes