The obstinacy of cleverness and reason is nothing to the obstinacy of folly and inanity. Harriet Beecher Stowe
The difference between perseverance and obstinacy is that one often comes from a strong will, and the other from a strong won’t. Henry Ward Beecher
Obstinacy is the sister of constancy, at least in vigour and stability. Michel de Montaigne
OBSTINATE, adj. Inaccessible to the truth as it is manifest in the splendor and stress of our advocacy. The popular type and exponent of obstinacy is the mule, a most intelligent animal. Ambrose Bierce
A narrow mind begets obstinacy; we do not easily believe what we cannot see. John Dryden
An obstinate man does not hold opinions, but they hold him. Samuel Butler
Obstinacy is the result of the will forcing itself into the place of the intellect. Arthur Schopenhauer
Men of integrity are generally pretty obstinate, in adhering to an opinion once adopted. William Cobbett
Obstinacy in a bad cause is but constancy in a good. Thomas Browne