Those who never retract their opinions love themselves more than they love the truth. (Joseph Joubert, 18th-19th century French essayist)
People who are stubborn about their opinions and never seem willing to consider other options are sometimes described as bull-headed. It’s not only difficult to carry on a meaningful conversation with them, but it’s virtually impossible to come to agreement on any issue. Progress is stymied by such an attitude. Seeking the truth requires open-mindedness.
Get the truth and never sell it; also get wisdom, discipline, and good judgment. (Proverbs 23:23)