In dealing with the arrogant asserter of doubt, it is not the right method to tell him to stop doubting. It is rather the right method to tell him to go on doubting, to doubt a little more, to doubt every day newer and wilder things in the universe, until at last, by some strange enlightenment, he may begin to doubt himself.
In Defense of Sanity: The Best Essays of G.K. Chesterton (ed. Ignatius Press, 2011) - ISBN: 9781586174897