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When in doubt, tell the truth. That maxim I did invent, but never expected it to be applied to me. I did say, "When you are in doubt," but when I am in doubt myself I use more sagacity.

Mark Twain (2008). “Mark Twain's Speeches: Easyread Large Bold Edition”, p.393, ReadHowYouWant.com
When in doubt, tell the truth. That maxim I did invent, but never expected it to be applied to me. I did say, When you are in doubt, but when I am in doubt myself I use more sagacity.