Source, in full
Purportedly a response by Chesterton to the question posed around 1910 by the Times of London (along with other luminaries), but biographer Kevin Belmonte, in 'Defiant Joy: the Remarkable Life & Impact of G.K. Chesterton', was unable to verify. Belmonte surmises its origin in an anecdote that while writing What's Wrong with the World (told in the book's preface), he would delight in telling society ladies that "I have been doing 'What is Wrong' all this morning."