Gilbert K. Chesterton Goes On Quotations

The whole modern world has divided itself into Conservatives and Progressives. The business of Progressives is to go on making mistakes. The business of the Conservatives is to prevent the mistakes from being corrected.

The world will very soon be divided, unless I am mistaken, into those who still go on explaining our success, and those somewhat more intelligent who are trying to explain our failure.

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.