I don't remember this passage in Chesterton's Orthodoxy, but it's useful these days, courtesy of Stuart Buck @ The Buck Stops Here:

If it comes to human testimony there is a choking cataract of human testimony in favour of the supernatural.

If you reject it, you can only mean one of two things. You reject the peasant's story about the ghost either because the man is a peasant or because the story is a ghost story. That is, you either deny the main principle of democracy, or you affirm the main principle of materialism -- the abstract impossibility of miracle.

You have a perfect right to do so; but in that case you are the dogmatist.

It is we Christians who accept all actual evidence -- it is you rationalists who refuse actual evidence being constrained to do so by your creed.

But I am not constrained by any creed in the matter, and looking impartially into certain miracles of mediaeval and modern times, I have come to the conclusion that they occurred. All argument against these plain facts is always argument in a circle.

If I say, "Mediaeval documents attest certain miracles as much as they attest certain battles," they answer, "But mediaevals were superstitious"; if I want to know in what they were superstitious, the only ultimate answer is that they believed in the miracles. If I say "a peasant saw a ghost," I am told, "But peasants are so credulous." If I ask, "Why credulous?" the only answer is -- that they see ghosts.