OBSTINATE, adj. Inaccessible to the truth as it is manifest in the splendor and stress of our advocacy.
Ambrose Bierce (1842-1914?) American writer and journalist
“Obstinate,” The Devil’s Dictionary (1911)
(Source)
Originally published in the "Cynic's Word Book" column in the New York American (1904-10-05) and the "Cynic's Dictionary" column in the San Francisco Examiner (1904-10-31).