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PEIRCE'S LOGIC OF INQUIRY OF THE 1870'S
Fragmentary Remains of a Projected Book to be called "Logic"
by CHARLES S. PEIRCE
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Fragment 1c
Ch. 1: Doubt and Belief
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MS 184 (Robin 363): CP 7.314n4 (not in Writings)
Winter-Spring 1872

Editorial Note (Joseph Ransdell): This brief fragment is presented here as it appears in the Collected Papers of Charles S. Peirce 7.314n4. (It does not appear in Writings 3.)

Doubt has degrees and may approximate indefinitely to belief, but when I doubt, the effect of the mental judgment will not be seen in my conduct as invariably or to the full extent that it will when I believe. Thus, if I am perfectly confident that an insurance company will fulfill their engagements I will pay them a certain sum for a policy, but if I think there is a risk of their breaking, I shall not pay them so much.