Lunacy

In that moment the universe and the stars swung just a hair's breadth from their balance, and the foundations of the earth were moved. But for the same reason that I believe in Democracy, for the same reason that I believe in free will, for the same reason that I believe in fixed character of virtue, the reason that could only be expressed by saying that I do not choose to be a lunatic, I continued to believe that this honest cabman was wrong, [and that my memory had some correspondence with reality,] and I repeated to him that I had really taken him at the corner of Leicester-square.

—G.K. Chesterton, Tremendous Trifles, The Extraordinary Cabman.