The Commens Dictionary
Quote from ‘Reason's Rules’
The state of doubt is a state of indeterminacy between two propositions. It is unsatisfactory. It is a state of stimulation, accompanied by a peculiar feeling.
MS [R] 596:12
‘Doubt’ (pub. 15.08.17-13:27). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-reasons-rules-16.