From Girolamo Cardano, The Book of My Life:
... neither at Milan, nor at Pavia, nor in Bologna, nor in France or Germany, have I ever found a man who could successfully controvert or dispute me within the last twenty-five years. Yet I do not vaunt my powers on this account, for I think that, had I been made of stone, the same things would have come to pass. It is the result of the lack of clear thinking on the part of those who would challenge me, and no more an special dispensation to my own nature or to my own distinction, that it can be counted glorious for the cuttlefish to eject the shadows of its inky humor about the dolphin and force it to flee; that is merely the result of being born a cuttlefish.It's not that I'm that smart -- it's that you are that dumb!