Digital Companion to C. S. Peirce
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Some Wit, Wisdom & Bewilderment
...knowledge is nothing, quite nothing but a counterfeit, unless it would under some circumstances determine conduct. It must have real effects. In fact any outward sign must, not merely as a thing, but as a sign produce physical effects in order to be communicated. And any inward sign must doubtless produce physical effects, as a sign.
Dichotomic Mathematics, 1904