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Well, if I am not drunk, I am mad," replied Syme with perfect calm; "but I trust I can behave like a gentleman in either condition.

Gilbert K. Chesterton (2013). “The Essential Gilbert K. Chesterton”, p.152, Simon and Schuster
Well, if I am not drunk, I am mad, replied Syme with perfect calm; but I trust I can behave like a gentleman in either condition.