Full Idea
To set up a philosophy which barricades the road of further advance toward the truth is the one unpardonable offence in reasoning.
Gist of Idea
The one unpardonable offence in reasoning is to block the route to further truth
Source
Charles Sanders Peirce (Reasoning and the Logic of Things [1898], IV)
Book Reference
Peirce,Charles Sanders: 'Reasoning and the Logic of Things', ed/tr. Ketner,K.L. [Harvard 1992], p.179
A Reaction
This is Popper's rather dubious objection to essentialism in science. Yet Popper tried to do the same thing with his account of induction.
Related Idea
Idea 12179 Essentialist views of science prevent further questions from being raised [Popper]