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The difference between perseverance and obstinacy is that one often comes from a strong will, and the other from a strong won't.

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

They defend their errors as if they were defending their inheritance.

'Tis known by the name of perseverance in a good cause -- and of obstinacy in a bad one.

The obstinacy of cleverness and reason is nothing to the obstinacy of folly and inanity.