Modern masters of science are much impressed with the need of beginning all inquiry with a fact. The ancient masters of religion were quite equally impressed with that necessity. They began with the fact of sin—a fact as practical as potatoes. Whether or no man could be washed in miraculous waters, there was no doubt at any rate that he wanted washing. . . .
In this remarkable situation it is plainly not now possible (with any hope of a universal appeal) to start, as our fathers did, with the fact of sin. This very fact which was to them (and is to me) as plain as a pikestaff, is the very fact that has been specially diluted or denied. But though moderns deny the existence of sin, I do not think that they have yet denied the existence of a lunatic asylum. We all agree still that there is a collapse of the intellect as unmistakable as a falling house. Men deny hell, but not, as yet, Hanwell. For the purpose of our primary argument the one may very well stand where the other stood. I mean that as all thoughts and theories were once judged by whether they tended to make a man lose his soul, so for our present purpose all modern thoughts and theories may be judged by whether they tend to make a man lose his wits.
G.K. Chesterton, Orthodoxy, Chapter II: The Maniac