And the difference between us was very deep, because it was a difference as to the object of the whole thing called broad-mindedness or the opening of the intellect. For my friend said that he opened his intellect as the sun opens the fans of a palm tree, opening for opening’s sake, opening infinitely for ever. But I said that I opened my intellect as I opened my mouth, in order to shut it again on something solid. I was doing it at the moment. And as I truly pointed out, it would look uncommonly silly if I went on opening my mouth infinitely, for ever and ever.
–G.K. Chesterton, “The Extraordinary Cabman“