Henry Louis Mencken (September 12, 1880 – January 29, 1956)
As for me, I am never absolutely certain that I am right, and for the plain reason that I am never absolutely certain that anything is true. It may seem to me to be true but I may be quite unable to imagine any proof of its falsity – but that is simply saying that my imagination is limited, not that the proposition itself is immovably sound. Some other man, better-born than I, or drinking better liquor, may disprove it tomorrow. And if not tomorrow, then the day after tomorrow, or maybe next week or next year. I know of no so-called truth that quite escapes this possibility. Anything is conceivable in a world so irrational as this one.