Full Idea
To declare that which is the least bit dubious as absolutely false is to declare war on logos.
Gist of Idea
Labelling slightly doubtful things as false is irrational
Source
comment on René Descartes (Meditations [1641], §1.17) by David Roochnik - The Tragedy of Reason p.72
Book Reference
Roochnik,David: 'The Tragedy of Reason: the Platonic logos' [Routledge 1990], p.72