I have been asked to explain what I meant by saying that "Literature is a luxury; fiction is a necessity." I have no notion when I said it or where I said it, or even whether I said it; in the sense that I do not now remember ever saying it at all. But I do know why I said it; if I ever said it at all. That is the advantage of believing in what some call dogma and others call logic. Some people seem to imagine that a man being sceptical and changing his beliefs, or even a man being cynical and disregarding his beliefs, is a sort of advantage to him in liberality and flexibility of mind. The truth is exactly the other way. By the very laws of the mind, it is more difficult to remember disconnected things than connected things; and a man is much more in control of a whole range of controversy if he has connected beliefs than if he had never had anything but disconnected doubts. Therefore I can immediately understand the sentence submitted to me, as if it were a sentence made up by somebody else; as perhaps it was.
G. K. Chesterton, "Fiction as Food," in The Spice of Life and Other Essays.