The Commens Dictionary

Quote from ‘Grand Logic 1893: Division III. Substantial Study of Logic Chapter VI. The Essence of Reasoning’


…there is a mysterious something determining a regularity in Inner Experience, analogous to that Nature which [is] our name for the corresponding mystery of the Outer World, No doubt, the two mysteries are in great measure at one. They must be so; for it is il lume naturale which, guiding the minds of Galileo and other inceptors of science, enabled them to make our first steps in dynamics, geometry, and in other branches of physics. There is no warrant for supposing that outward Nature and the inward Light are altogether at one. “Ten thousand pounds to one pennie” they are not so. But doubtless they are so nearly so that were the Light of Nature only strong enough, the Hegelian dialectic or something like it would be a sound method of investigation. Men have an unconquerable natural inclination to think so. The Light of Nature itself represents itself as able to show how the Outward World is. But experience shows its forecasts are untrustworthy.

MS [R] 408:148-9
Editorial Annotations: 

Inconsistent page numbers; the first page number appears to have been changed to 150, but the second is 149.

‘Il Lume Naturale’ (pub. 24.08.15-16:33). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from
Aug 24, 2015, 16:33 by Mats Bergman