Obstinacy

"An obstinate man does not hold opinions, but they hold him; for when he is once possessed with an error, it is, like a devil, only cast out with great difficulty."

"Obstinacy is ever most positive when it is most in the wrong."

"His still refuted quirks he still repeats, New-raised objections with new quibbles meets; Till sinking in the quicksand he defends, He dies disputing, and the contest ends."