Who said “The rule is perfect: in all matters of opinion our adversaries are insane.”?

Verified

Mark Twain. A published source records them saying or writing it.

SourceChristian Science (1907)

Evidence: Wikiquote · How we check

Source checked · Something wrong? Report a correction

Cite this quote

For academic work, cite the original where you can: Christian Science (1907).

APA

Twain, M. (n.d.). The rule is perfect: in all matters of opinion our adversaries are insane. [Quotation]. Famous Quotations Network. Retrieved October 24, 2026, from https://www.famous-quotations.com/quotes/1683-the-rule-is-perfect-in-all-matters-of/

MLA

Twain, Mark. “The rule is perfect: in all matters of opinion our adversaries are insane.” Famous Quotations Network, https://www.famous-quotations.com/quotes/1683-the-rule-is-perfect-in-all-matters-of/. Accessed 24 Oct. 2026.

Chicago

Twain, Mark. “The rule is perfect: in all matters of opinion our adversaries are insane.” Famous Quotations Network. Accessed October 24, 2026. https://www.famous-quotations.com/quotes/1683-the-rule-is-perfect-in-all-matters-of/.